The atomic mass of an element is the sum of the number of protons and neutrons in its nucleus. So Helium has 2 neutron.
Since the atomic number of helium is 2, it means that helium has 2 protons. The atomic mass of helium is 4. To find the number of neutrons, we subtract the number of protons (2) from the atomic mass (4). Therefore, helium must have 2 neutrons.
Neutrons are subatomic particles that have a mass nearly equal to that of protons but carry no electric charge. They are found in the nucleus of an atom along with protons. In the case of helium, the nucleus contains 2 protons and 2 neutrons, giving it an atomic mass of 4. The presence of neutrons contributes to the stability and mass of the atom without affecting its chemical properties.
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Charlotte is driving at 71.3 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 3.98 s. How far has Charlotte traveled in feet during this time?
Charlotte traveled 417.08 feet during this time. Given the Charlotte's speed is 71.3 mi/h.The distance travelled by the car in 1 hour is given by the product of speed and time = 71.3 x 1 = 71.3 miles (in 1 hour)
Let's find out how many feet Charlotte has traveled in 3.98 seconds.For that, we need to convert miles per hour into feet per second.
We know that 1 mile is equal to 5,280 feet1 hour is equal to 60 minutes1 minute is equal to 60 seconds
Hence, 1 hour is equal to 60 x 60 = 3600 seconds
Therefore, to convert miles per hour to feet per second, we have to multiply miles per hour by 1.47. (1.47 = 5280 feet/3600 seconds)
71.3 mi/h x 1.47 = 104.851 ft/s
This means that the car is traveling at 104.851 feet per second in the 3.98 seconds that Charlotte took her eyes off the road.
The distance covered in feet is given by the product of time and distance,
where time is in seconds and distance in feet.= Speed x Time (with distance in feet and time in seconds)
= 104.851 x 3.98= 417.08 feet (rounded off to two decimal places)
Thus, Charlotte traveled 417.08 feet during this time
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Which biotic factor would have the greatest impact on the number of rabbits in a meadow?
The biotic factor that would have the greatest impact on the number of rabbits in a meadow is the availability of food. Food availability directly affects the survival, reproduction, and overall population size of rabbits.
Rabbits are herbivores, and their diet consists mainly of plant materials such as grasses, herbs, and other vegetation found in meadows. The abundance and quality of food sources in the meadow will determine the carrying capacity of the habitat for rabbits.
If there is an ample supply of food in the meadow, the rabbit population can thrive and increase in number. Sufficient food resources provide the necessary energy and nutrients for rabbits to survive, reproduce, and raise their offspring. In such cases, the rabbit population can grow and reach its maximum potential.
On the other hand, if the food supply is limited or becomes scarce, it will have a significant impact on the rabbit population. Insufficient food availability can lead to malnutrition, decreased reproductive success, and increased vulnerability to predation and diseases. As a result, the rabbit population may decline, and individuals may struggle to survive.
Therefore, the availability of food is a critical biotic factor that directly influences the number of rabbits in a meadow.
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If 57. 0 g of ammonia are combined with 290. 0g of copper (lll) oxide, identify the limiting reagent
Copper (III) oxide is the limiting reagent.
To identify the limiting reagent, we need to compare the number of moles of ammonia and copper (III) oxide and determine which reactant is consumed completely.
Calculate the number of moles of ammonia:
moles of ammonia = mass of ammonia / molar mass of ammonia
molar mass of ammonia (NH₃) = 14.01 g/mol + 3(1.01 g/mol) = 17.03 g/mol
moles of ammonia = 57.0 g / 17.03 g/mol = 3.35 mol
Calculate the number of moles of copper (III) oxide:
moles of copper (III) oxide = mass of copper (III) oxide / molar mass of copper (III) oxide
molar mass of copper (III) oxide (Cu₂O₃) = 2(63.55 g/mol) + 3(16.00 g/mol) = 225.55 g/mol
moles of copper (III) oxide = 290.0 g / 225.55 g/mol = 1.29 mol
Since the number of moles of copper (III) oxide (1.29 mol) is less than the number of moles of ammonia (3.35 mol), copper (III) oxide is the limiting reagent. This means that copper (III) oxide will be completely consumed in the reaction, while there will be an excess of ammonia remaining.
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CaCl2 weighs 350g. How many moles are there in 350g of the compound CaCl2?
To determine the number of moles in 350 grams of CaCl2, we need to use the molar mass of CaCl2, which is the sum of the atomic masses of calcium (Ca) and chlorine (Cl).
The atomic mass of calcium (Ca) is approximately 40.08 g/mol, and chlorine (Cl) has an atomic mass of approximately 35.45 g/mol. Since there are two chlorine atoms in CaCl2, we multiply the atomic mass of chlorine by 2.
Molar mass of CaCl2 = (atomic mass of Ca) + (atomic mass of Cl * 2)
Molar mass of CaCl2 = 40.08 g/mol + (35.45 g/mol * 2)
Molar mass of CaCl2 ≈ 110.98 g/mol
To calculate the number of moles, we can use the formula:
Moles = Mass / Molar mass
Substituting the given mass of 350 grams into the formula:
Moles = 350 g / 110.98 g/mol
Moles ≈ 3.15 mol
Therefore, there are approximately 3.15 moles of CaCl2 in 350 grams of the compound.
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How many milliliters of water are needed to produce a 5. 5% (m/v) solution with 26 g of salt?
To determine the volume of water needed to make a 5.5% (m/v) solution with 26 g of salt, we can use the formula:
(mass of solute / concentration) = volume of solution
In this case, the mass of the solute (salt) is given as 26 g, and the concentration is 5.5% (m/v), which means 5.5 g of salt is dissolved in 100 mL of solution.
Let's calculate the volume of the solution:
(26 g / 5.5 g/100 mL) = volume of solution
Cross-multiplying, we have:
26 g * 100 mL = 5.5 g * volume of solution
2600 g·mL = 5.5 g * volume of solution
Simplifying:
volume of solution = (2600 g·mL) / 5.5 g
volume of solution ≈ 472.73 mL
Therefore, approximately 472.73 mL of water is needed to produce a 5.5% (m/v) solution with 26 g of salt.
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A building contractor is to dig a foundation 48 feet long 15 feet wide and 9 feet deep. The contractor pays $20 per load for Trucks to remove the dirt. Each truck hoods 8 yd. ³. What is the cost to the contractor to have all the dirt all the way. 
To calculate the cost to the contractor for removing all the dirt, we need to determine the volume of the dirt that needs to be removed and then calculate the number of truckloads required.
Given the dimensions of the foundation as 48 feet long, 15 feet wide, and 9 feet deep, we can calculate the total volume of the dirt as follows:
Volume = length × width × depth
Volume = 48 ft × 15 ft × 9 ft
Volume = 6480 cubic feet
Since each truck can hold 8 cubic yards (yd³) of dirt, we need to convert the volume to cubic yards:
1 cubic yard = 27 cubic feet
Volume in cubic yards = 6480 cubic feet / 27 cubic feet per yard
Volume in cubic yards = 240 cubic yards
Now, we can calculate the number of truckloads required:
Number of truckloads = Volume in cubic yards / Truck capacity
Number of truckloads = 240 cubic yards / 8 cubic yards per truck
Number of truckloads = 30 truckloads
Given that each truckload costs $20, the total cost to the contractor for removing all the dirt would be:
Total cost = Number of truckloads × Cost per truckload
Total cost = 30 truckloads × $20 per truckload
Total cost = $600
Therefore, the cost to the contractor for removing all the dirt would be $600.
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A sample of blood is found to contain 64. 5 micrograms of valproic acid. How many milligrams of valproic acid does this blood sample contain
The blood sample contains 64.5 micrograms of valproic acid, which is equivalent to 0.0645 milligrams. To convert micrograms to milligrams, you divide the value by 1000 since there are 1000 micrograms in one milligram.
In the given blood sample, the amount of valproic acid is 64.5 micrograms. To convert this to milligrams, we divide the value by 1000 since there are 1000 micrograms in one milligram. So, 64.5 micrograms divided by 1000 equals 0.0645 milligrams. Therefore, the blood sample contains 0.0645 milligrams of valproic acid.
This conversion is necessary when dealing with different units of measurement. In this case, we are converting from a smaller unit (micrograms) to a larger unit (milligrams). By using the conversion factor of 1000, we can easily convert the given amount to the desired unit. It is important to pay attention to the conversion factor and ensure that the units cancel out correctly to obtain the desired result.
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What element is1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ corresponds to the element Radon (Rn) with atomic number 86.
In the electron configuration, each number and letter combination represents a specific orbital and the number of electrons occupying that orbital. The numbers represent the principal energy levels (or shells) and the letters represent the sublevels (s, p, d, f).
Breaking down the electron configuration;
1s²; This indicates that the first energy level (n=1) has 2 electrons in the 1s orbital.
2s² 2p⁶; The second energy level (n=2) contains 2 electrons in the 2s orbital and 6 electrons in the 2p orbital.
3s² 3p⁶; The third energy level (n=3) has 2 electrons in the 3s orbital and 6 electrons in the 3p orbital.
4s² 3d¹⁰ 4p⁶; The fourth energy level (n=4) contains 2 electrons in the 4s orbital, 10 electrons in the 3d orbital, and 6 electrons in the 4p orbital.
5s² 4d¹⁰ 5p⁶; The fifth energy level (n=5) has 2 electrons in the 5s orbital, 10 electrons in the 4d orbital, and 6 electrons in the 5p orbital.
6s² 4f¹⁴ 5d¹⁰ 6p⁶; The sixth energy level (n=6) contains 2 electrons in the 6s orbital, 14 electrons in the 4f orbital, 10 electrons in the 5d orbital, and 6 electrons in the 6p orbital.
By referring to the periodic table, we can find that the element with this electron configuration is Radon (Rn) with atomic number 86. Radon is a noble gas and is found in the last group (Group 18) of the periodic table.
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Which pair of elements are the most common found in the sun?.
Hydrogen and helium are the most common elements found in the Sun. The Sun has an estimated composition of 70 percent hydrogen and 28 percent helium by mass, with heavier elements making up the remaining 2 percent.
Hydrogen and helium are the most prevalent elements in the Sun's composition. As stated before, hydrogen accounts for 70 percent of the Sun's mass, while helium accounts for 28 percent. The remaining 2 percent is composed of heavier elements such as carbon, oxygen, and iron.The Sun, like other stars, is a massive, glowing ball of plasma. The Sun's core is where hydrogen fusion takes place, producing helium as a byproduct. Helium is denser than hydrogen, so it gradually sinks towards the Sun's core, which causes the Sun's core to become denser over time. This increase in density raises the Sun's temperature and pressure, making it possible for hydrogen fusion to occur.The Sun's composition is critical in comprehending its properties and behavior. Because hydrogen fusion produces an enormous amount of energy, the Sun's composition allows it to shine brightly and provide warmth and light to Earth. Additionally, scientists utilize the Sun's composition as a guide for understanding the formation and evolution of the solar system.
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Calculate the number of moles in 75. 0 g of dinitrogen trioxide.
The number of moles in 75.0 g of dinitrogen trioxide is 0.8158 moles.
To calculate the number of moles in 75.0 g of dinitrogen trioxide, we will need to use the formula;
moles = mass/molar mass
Molar mass of dinitrogen trioxide (N2O3) = (2 × 14.01 g/mol) + (3 × 16.00 g/mol)= 92.01 g/mol
Using the above formula; moles of N2O3 = 75.0 g / 92.01 g/mol= 0.8158 moles
75.0 g of dinitrogen trioxide contains 0.8158 moles.
The number of moles in 75.0 g of dinitrogen trioxide is 0.8158 moles.
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Select all the correct answers. A sample of an unknown compound has a percent composition of 52. 14% carbon, 13. 13% hydrogen, and 34. 73% oxygen. Which compounds could the sample be? CH3CH3CH2O2 C2H5OH C4H10O2 C4H12O2 CH3CH3CH2OOH.
The correct answer is C_{2}H_{5}OH and C_{4}H_{10}O_{2}.The percent composition of a compound is a term that refers to the percentage of the total mass of a compound that is made up of a specific element.
The molar mass of a molecule of a compound, on the other hand, is the sum of the masses of all the atoms in the molecule. As a result, the percent composition can be calculated if the molar mass of the compound is known. The mass percentage of carbon, hydrogen, and oxygen in the unknown compound is given as 52.14 percent, 13.13 percent, and 34.73 percent, respectively. To find out which of the options might be the correct answer, we'll have to compare their percent compositions to that of the unknown compound. Only options C_{2}H_{5}OH and C_{4}H_{10}O_{2} have percent compositions that are close to the given values. As a result, C_{2}H_{5}OH and C_{4}H_{10}O_{2} are the correct answers. The calculation process for the percent composition of each molecule is as follows: Percent composition of carbon for C_{2}H_{5}OH can be calculated as follows:2*12.011/46.069*100% = 52.16%Percent composition of hydrogen for C_{2}H_{5}OH can be calculated as follows:6*1.008/46.069*100% = 13.09%Percent composition of oxygen for C_{2}H_{5}OH can be calculated as follows:1*15.999/46.069*100% = 34.75%Percent composition of carbon for C_{4}H_{10}O_{2} can be calculated as follows:4*12.011/102.13*100% = 47.05%Percent composition of hydrogen for C_{4}H_{10}O_{2} can be calculated as follows:10*1.008/102.13*100% = 9.81%Percent composition of oxygen for C_{4}H_{10}O_{2} can be calculated as follows:2*15.999/102.13*100% = 31.41%Therefore, only C_{2}H_{5}OH and C_{4}H_{10}O_{2} are correct.
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If 0. 160 moles of AgNOâ‚ react with 0. 155 moles of Hâ‚‚SOâ‚„ according to this UNBALANCED equation below, what is the mass in grams of Agâ‚‚SOâ‚„ that could be formed? AgNOâ‚(aq) Hâ‚‚SOâ‚„ (aq) → Agâ‚‚SOâ‚„ (s) HNOâ‚ (aq).
The mass in grams of Agâ‚‚SOâ‚„ that could be formed is 0. 164 g of Ag₂SO₄ can be formed.
AgNO₃ + H₂SO₄ → Ag₂SO₄ + 2 HNO₃According to the above-balanced equation,1 mole of AgNO₃ is reacted with 1 mole of H₂SO₄ to form 1 mole of Ag₂SO₄.We are given that,0.160 moles of AgNO₃ react with 0.155 moles of H₂SO₄.Hence,AgNO₃ is the limiting reagent.
Using the molar mass of Ag₂SO₄, we can determine the mass of Ag₂SO₄. Hence,0.160 moles of AgNO₃ = 0.160 x 2 = 0.320 moles of Ag₂SO₄Molar mass of Ag₂SO₄ = 2(107.87) + 32.07 = 243.81 g/molTherefore,Mass of Ag₂SO₄ = 0.320 moles x 243.81 g/mol = 78.098 g ≈ 0.164 g.Hence, 0. 164 g of Ag₂SO₄ can be formed.
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Find them number of moles in 7.05 x 10^23 molecules of CO2
How many representative particles are in 288 grams of Ca(NO3)2?
1. Number of moles in 7.05 x 10^23 molecules of CO2We know that one mole of any substance contains Avogadro's number (6.022 x 10²³) of particles (atoms, molecules, or formula units).So, the number of moles in 7.05 x 10²³ molecules of CO₂ can be calculated as:Number of moles = Number of molecules / Avogadro's number Therefore,Number of moles = (7.05 x 10²³) / (6.022 x 10²³)= 1.17 moles (approx.)
Therefore, there are approximately 1.17 moles in 7.05 x 10²³ molecules of CO₂.2. Representative particles in 288 grams of Ca(NO₃)₂The term 'representative particle' refers to the particles of an element, molecules, or formula unit of an ionic compound. The representative particles in a substance are used to convert between mass and number of particles in stoichiometry problems.
Given mass of Ca(NO₃)₂ = 288 gMolar mass of Ca(NO₃)₂ = (1 x 40.1) + (2 x 14.0) + (6 x 16.0) = 164.1 g/mol Number of moles in 288 g of Ca(NO₃)₂ = 288 / 164.1 = 1.75 mol Now, using the stoichiometry of Ca(NO₃)₂,1 mole of Ca(NO₃)₂ contains 3 moles of ions Number of representative particles of Ca(NO₃)₂ in 1.75 mol of Ca(NO₃)₂ = 1.75 × 3 × Avogadro's number= 1.05 × 10²⁴ representative particles Therefore, there are 1.05 × 10²⁴ representative particles in 288 grams of Ca(NO₃)₂.
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how many moles are contained in .800 g of calcium chloride
The number of moles of calcium chloride in 0.800 g is 0.00721 mol.
To find the number of moles of calcium chloride in 0.800g, the first step is to calculate the molar mass of CaCl2. This can be done by adding the atomic masses of calcium (Ca) and chlorine (Cl) together.Molar mass of CaCl2 = (1 x atomic mass of Ca) + (2 x atomic mass of Cl)= 40.08 + (2 x 35.45)= 110.98 g/molOnce the molar mass is determined, the number of moles can be calculated using the formula:n = m/M
where n is the number of moles, m is the mass in grams, and M is the molar mass in grams per mole.n = 0.800g / 110.98 g/mol = 0.00721 mol
Therefore, there are 0.00721 moles of calcium chloride in 0.800 grams of it.
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Which pair of elements has the most similar properties?
C. Be and Ba
D. Li and Be
B. Na and Ca
A. H and Mg
The elements Li and Be have the most similar properties. Lithium and beryllium are elements in the periodic table. Beryllium has four electrons while lithium has three Li and Be.
Both of these elements have similar chemical and physical characteristics. The similarity can be attributed to the fact that they are both elements in the periodic table's same group, group 1.Although the other pairs of elements in the question share some similarities, Li and Be have the most similar properties. Beryllium and lithium have similar chemical reactivity because of their electron configurations and atomic structures.
Beryllium and lithium have the same valence electron configuration, which contributes to their similarities.Beryllium and lithium both have the properties of metals and belong to the same group. Lithium is, nevertheless, a lightweight metal, while beryllium is a relatively light element.
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How many moles of H2SO4 are produced from 5 moles of Na2SO4?
H2SO4 + 2 NaOH → Na2SO4 + 2 H2O
To determine the number of moles of H2SO4 produced from 5 moles of Na2SO4 we must use stoichiometry.
It is important to understand the stoichiometry concept. Stoichiometry is the calculation of quantities in chemical reactions. It deals with the calculations of reactants and products in chemical reactions. It is used to calculate the reactants or products of a chemical reaction. The stoichiometry concept is expressed using balanced chemical equations. In this case, the balanced chemical equation is:H2SO4 + 2 NaOH → Na2SO4 + 2 H2OThe stoichiometry concept can be applied to find the number of moles of H2SO4 produced from 5 moles of Na2SO4.
The first step is to identify the mole ratio between the two compounds. The mole ratio between H2SO4 and Na2SO4 is 1:1. This means that one mole of H2SO4 is produced for every one mole of Na2SO4.Using the mole ratio and the given number of moles of Na2SO4, we can calculate the number of moles of H2SO4 produced:1 mole of Na2SO4 produces 1 mole of H2SO4. Therefore,5 moles of Na2SO4 produce 5 moles of H2SO4.Answer:5 moles of H2SO4 are produced from 5 moles of Na2SO4.
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PH of a solution that has an [H3O+] = 6. 389×10−5 M ?
The pH of a solution can be calculated using the equation pH = -log[H3O+], where [H3O+] represents the concentration of hydronium ions in the solution.
Given that [H3O+] is 6.389×10^−5 M, we can substitute this value into the equation to find the pH.
pH = -log(6.389×10^−5)
To evaluate this expression, we take the negative logarithm of the concentration.
pH = -log(6.389×10^−5) = -(-4.195) = 4.195
Therefore, the pH of the solution is approximately 4.195.
The pH scale ranges from 0 to 14, where a pH value of 7 is considered neutral. A pH value less than 7 indicates an acidic solution, while a pH greater than 7 indicates a basic solution.
In this case, the pH of 4.195 suggests that the solution is acidic, as the concentration of hydronium ions is higher than the concentration of hydroxide ions.
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how could you show that a charged object could repel or attract another object without touching it?
and if you can do question 2 it would be really good <3
An object becomes electrically charged when negative charges move into it from a second object. does the second object also become electrically charged? Explain your answer.
To show that a charged object can repel or attract another object without touching it, you can perform the following experiment:
a) Take two small objects, such as balloons or lightweight balls, and hang them separately using strings so that they can freely swing.
b) Rub one of the objects with a material that can transfer charge, such as a wool cloth or a plastic rod. This will charge the object, giving it an excess of either positive or negative charges.
c) Bring the charged object close to the other object without touching it. Observe the behavior of the uncharged object.
If the charged object and the uncharged object have opposite charges (one positive and one negative), they will attract each other. The uncharged object will be drawn towards the charged object.
If the charged object and the uncharged object have the same charge (both positive or both negative), they will repel each other. The uncharged object will move away from the charged object.
This experiment demonstrates the electrostatic force, which is the force between charged objects that can cause attraction or repulsion, even without direct contact.
When an object becomes electrically charged and negative charges move into it from a second object, the second object does not necessarily become electrically charged. The transfer of negative charges from one object to another leaves the second object with a net positive charge.
During the charging process, negative charges are transferred from the second object to the first object. This leads to an excess of positive charges on the second object, as the removal of negative charges leaves behind a relative surplus of positive charges.
So, while the first object becomes negatively charged, the second object is left with an overall positive charge. This is because the negative charges have moved out of the second object, resulting in an imbalance of positive charges.
Therefore, the second object does not become electrically charged in the same way as the first object. Instead, it acquires a net positive charge due to the transfer of negative charges to the first object.
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do most moving objects travel at a constant speed?
Most moving objects do not travel at a constant speed. In reality, the speed of an object can vary due to various factors and conditions.
One key factor that affects the speed of an object is external forces. Objects experience forces like friction, air resistance, and gravitational pull, which can cause changes in speed. For example, when a car drives on a flat road, it may maintain a relatively constant speed. However, as the road inclines or declines, the force of gravity comes into play, altering the speed of the car.
Additionally, objects may encounter different surfaces or mediums that affect their speed. For instance, a ball rolling on a smooth, flat surface will experience less friction and maintain a more constant speed compared to a ball rolling on a rough or uneven surface.
Furthermore, objects can be subject to internal forces that result in changes in speed. A rocket, for instance, may accelerate to achieve escape velocity and then decelerate to enter orbit. Similarly, a cyclist may pedal harder or slower, resulting in changes in speed.
In the natural world, many factors influence the speed of objects. Wind, air density, temperature, and surface conditions are just a few examples. These variables create an ever-changing environment, making it rare for objects to maintain a constant speed for extended periods.
While some objects, such as those in controlled experiments or idealized situations, may exhibit constant speed under specific conditions, it is essential to consider the multitude of factors that can impact the speed of most moving objects.
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45. 0 g of oxygen gas are diluted with 55. 0 g of nitrogen gas in a 88. 0 L. Calculate the % (m/V) of oxygen
gas. Enter your answer in scientific notation.
To calculate the mass percentage (m/V) of oxygen gas in the mixture, we need to determine the mass of oxygen gas and the total volume of the mixture.
Given:
Mass of oxygen gas (O2) = 0 g
Mass of nitrogen gas (N2) = 55.0 g
Total volume of the mixture = 88.0 L
To calculate the mass percentage of oxygen gas (O2), we use the following formula:
mass percentage (m/V) = (mass of oxygen gas / total mass of the mixture) * 100
First, we need to calculate the total mass of the mixture by adding the masses of oxygen and nitrogen:
Total mass of the mixture = Mass of oxygen + Mass of nitrogen
Total mass of the mixture = 0 g + 55.0 g = 55.0 g
Now, we can substitute the values into the mass percentage formula:
mass percentage (m/V) = (0 g / 55.0 g) * 100
Calculating the expression:
mass percentage (m/V) = 0 * 100 / 55.0
mass percentage (m/V) = 0
Therefore, the mass percentage (m/V) of oxygen gas in the mixture is 0%.
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Name the processes in which materials change from one form to another
Explains the processes in which materials change from one form to another.Processes in which materials change from one form to another include:1
Melting: When materials change from a solid form to a liquid form, it is known as melting. It typically occurs when materials are heated to their melting point, which is the temperature at which a solid material transforms into a liquid.2. Freezing: Freezing is the opposite of melting, in which a liquid changes to a solid when it is cooled below its freezing point.3.
Sublimation: Sublimation is the transition of a solid substance directly to a gas without passing through the liquid phase. It occurs when materials are heated below their boiling point.4. Condensation: Condensation is the process of converting a gas into a liquid. It typically happens when gas is cooled.5. Vaporization: Vaporization refers to the conversion of a liquid into a gas or vapor. This process typically happens when a liquid is heated to its boiling point.6. Deposition: Deposition is the process of a gas transforming into a solid without passing through the liquid phase.7. Dissolving: Dissolving is the process of a substance being absorbed by a liquid to form a solution.
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6 inches is equal to 152.4mm. Calculate the pressure of gas (Pgas) if the atmospheric pressure is 320mmHg
Answer: A
Explanation:
To calculate the pressure of the gas (Pgas) in mmHg, you can use the conversion ratio between inches and millimeters and the given atmospheric pressure:
1 inch = 25.4 mm
Therefore, to convert 6 inches to millimeters:
6 inches * 25.4 mm/inch = 152.4 mm
Now that we have the value in millimeters, we can compare it to the atmospheric pressure and calculate the pressure of the gas:
Pgas = Atmospheric pressure - Converted value
Pgas = 320 mmHg - 152.4 mmHg
Pgas = 167.6 mmHg
As most solid materials undergo melting, the particles in the material are compressed | spread apart. Thus, the material expands | contracts, and its density increases | decreases. Therefore, this portion of the material will rise | sink relative to the surrounding material.
As most solid materials undergo melting, the particles in the material spread apart. Thus, the material expands, and its density decreases. Therefore, this portion of the material will rise relative to the surrounding material.
When most solid materials undergo melting, the particles in the material are compressed to vibrate much more rapidly. Therefore, when melting takes place, the particles spread apart. Hence, the material expands, and its density decreases. Therefore, this portion of the material will rise relative to the surrounding material. In other words, when a solid material melts, the intermolecular forces between the particles weaken.
This results in the particles spreading apart from each other as they absorb heat energy from the surroundings. This ultimately increases the space between the particles, making the material less dense. The decrease in density makes the liquid portion lighter and less dense than the surrounding solid material, thus it rises relative to the surrounding material.
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A solution of cough syrup contains 5.00 % active ingredient by volume. If the total volume of the bottle is 37.0 mL , how many milliliters of active ingredient are in the bottle? Express your answer with the appropriate units.
The milliliters of active ingredient in the bottle are 1.85 mL.
To calculate the milliliters of active ingredient in the bottle, we need to multiply the volume of cough syrup by the percentage of the active ingredient.
Given that the volume of cough syrup is 37.0 mL and the active ingredient is present at a volume percentage of 5.00%, we can calculate the volume of the active ingredient as follows:
Volume of active ingredient in the bottle = volume of cough syrup × active ingredient by volume/100%
= 37.0 mL × 5.00%/100%
= 37.0 mL × 0.05
= 1.85 mL
Therefore, the milliliters of active ingredient in the bottle are 1.85 mL.
Based on the given volume of cough syrup (37.0 mL) and the active ingredient present at a volume percentage of 5.00%, the milliliters of active ingredient in the bottle amount to 1.85 mL.
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How many grams of ammonia would comprise a 2.00 mole sample of ammonia
We know that the molar mass of ammonia is 17.03 grams per mole. This means that 1 mole of ammonia will have a mass of 17.03 grams.
The mole concept is a convenient method of expressing the amount of a substance. Any measurement can be broken down into two parts – the numerical magnitude and the units that the magnitude is expressed in. We are given that we have a 2.00 mole sample of ammonia. This means that we have 2 times the amount of ammonia that we would have in a 1.00 mole sample.
To find the mass of our sample, we need to multiply the number of moles by the molar mass. This gives us :-
2.00 moles * 17.03 grams/mole = 34.06 grams
Therefore, our sample of ammonia has a mass of 34.06 grams.
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a student drops a bottle of shampoo because his hands were slippery from the shampoo. other than its slippery, what other tests would confirm which type of compound was in the shampoo
To confirm the type of compound present in the shampoo, several tests can be conducted. Here are a few possible tests:
pH Test: Shampoos often contain acidic or basic compounds to maintain the desired pH level. Using pH strips or a pH meter, the student can test the pH of the shampoo. Acidic shampoos typically have a pH below 7, while alkaline shampoos have a pH above 7.
Solubility Test: Different compounds have different solubilities in various solvents. The student can try dissolving a small amount of the shampoo in water, alcohol, or oil to observe the solubility. The results can provide insights into the presence of certain compounds such as salts, surfactants, or oils.
Foaming Test: Shampoos often contain surfactants that produce foam when agitated with water. The student can mix a small amount of shampoo with water and vigorously shake it to observe the formation of foam. This test can indicate the presence of surfactants.
Combustion Test: By carefully burning a small amount of shampoo on a non-flammable surface, the student can observe the flame color and odor. Different compounds produce characteristic flame colors and smells upon combustion, which can help identify specific ingredients.
By conducting these tests, the student can gather additional information about the chemical nature of the compound in the shampoo and narrow down the possibilities of its composition.
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When tap water contains high levels of calcium, a substance called calcium carbonate (CaCO3) can build up at the mouths of water faucets. This buildup, called limescale, can prevent water from flowing through a faucet properly. To remove the calcium carbonate, you can scrub the faucet with citric acid (C6H8O7). Citric acid combines with calcium carbonate to form calcium citrate (Ca3C12H10O14), carbon dioxide gas (CO2), and water (H2O). The calcium citrate washes away easily, allowing water to flow through the faucet again. Which are products?
The products of the reaction are calcium citrate, carbon dioxide gas, and water.
The products of the reaction between citric acid (C6H8O7) and calcium carbonate (CaCO3) are:
Calcium citrate (Ca3C12H10O14): This is the compound formed by the combination of citric acid and calcium carbonate. It is a salt that is soluble in water and can be easily washed away.
Carbon dioxide gas (CO2): This gas is released as a byproduct of the reaction between citric acid and calcium carbonate. It is a colorless and odorless gas.
Water (H2O): Water is also produced as a byproduct of the reaction. It is formed when the hydrogen atoms from citric acid and the hydroxide ion from calcium carbonate combine.
So, the products of the reaction are calcium citrate, carbon dioxide gas, and water.
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The specific heat of copper is 0. 0920 cal/g °c, and the specific heat of silver is 0. 0562 cal/g °c. If 100 cal of heat is added to one g of each metal at 25 °c, what is the expected result?.
The specific heat of copper is 0. 0920 cal/g °c, and the specific heat of silver is 0. 0562 cal/g °c. If 100 cal of heat is added to one g of each metal at 25 °c, then the expected result will be that the copper's temperature increases by more than that of silver.Copper has a higher specific heat capacity than silver.
This implies that copper requires more energy than silver to increase its temperature by one degree. The specific heat of copper is 0.0920 cal/g °C, while the specific heat of silver is 0.0562 cal/g °C, as previously mentioned. As a result, the temperature of one gram of copper will rise more slowly than that of silver when the same quantity of heat is applied to both. As a result, the temperature of copper will rise by less than the temperature of silver when 100 cal of heat is added to each at 25°C.Since the mass is the same, the amount of heat supplied is the same for each material (100 cal), thus:q = m × c × ΔT is the formula for determining the temperature change (ΔT) for a given quantity of heat (q), mass (m), and specific heat (c).q = m × c × ΔTcopper: ΔT = q/mc= 100/1× 0.0920ΔT = 108.7 °Csilver: ΔT = q/mc= 100/1× 0.0562ΔT = 177.9 °CTherefore, 100 cal of heat added to 1 g of copper and silver would result in copper's temperature increasing by less than that of silver.
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Madalyn uses her thermometer and finds the boiling point of ethyl
alcohol to be 315K. She looks in a reference book and finds that the actual
boiling point of ethyl alcohol is 353K. What is his percent error?
To calculate the percent error, we need to compare the measured value (315K) with the accepted or actual value (353K).
The formula for percent error is:
Percent Error = ((|Measured Value - Actual Value|) / Actual Value) * 100
Substituting the given values into the formula, we get:
Percent Error = ((|315K - 353K|) / 353K) * 100
Simplifying further:
Percent Error = (| -38K| / 353K) * 100
Percent Error = (38K / 353K) * 100
Percent Error ≈ 10.77%
Therefore, the percent error in Madalyn's measurement of the boiling point of ethyl alcohol is approximately 10.77%. This indicates that her measured value is around 10.77% lower than the accepted value. It is important to note that positive percent error would indicate an overestimation, while negative percent error would indicate an underestimation.
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Viewed through a spectroscope, the spectral profile of a yellow street lamp has a narrow line in the yellow region of the visible spectrum against a black background. Is the street lamp an incandescent or an atomic source of light? What's happening in the lamp that causes light to be emitted?
The yellow light emitted by the street lamp is the result of an atomic process.
When viewed through a spectroscope, the spectral profile of a yellow street lamp has a narrow line in the yellow region of the visible spectrum against a black background. Is the street lamp an incandescent or an atomic source of light?When viewed through a spectroscope, the spectral profile of a yellow street lamp that has a narrow line in the yellow region of the visible spectrum against a black background is an atomic source of light. It is because an atomic source of light gives a spectral line spectrum of light, whereas an incandescent source of light gives a continuous spectrum of light. The emission spectrum of a gas is a pattern of specific wavelengths or frequencies of electromagnetic radiation that are emitted by atoms or molecules when they are stimulated to the excited state. The energy released is in the form of electromagnetic radiation, and each type of gas has its unique pattern of spectral lines. Hence, the yellow street lamp is an atomic source of light.A yellow street lamp emits light as a result of atomic processes. The light is caused by the atoms of the gas inside the lamp being excited, which causes the electrons to move from their ground state to an excited state. When these electrons return to their original energy level, the excess energy is emitted in the form of electromagnetic radiation, which is in the visible range. The atoms inside the street lamp emit light when they lose energy, with this light being of a specific frequency or wavelength. This pattern of wavelengths produces a spectral line that is observed when the light emitted by the street lamp is passed through a spectroscope. Therefore, the yellow light emitted by the street lamp is the result of an atomic process.
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