The reaction would be endothermic since heat flowed INTO the system
The temperature of the water bath would down since heat left the water and entered the system
The piston would move in since it is doing work ON the system.
The reaction would absorb energy since both heat and work are being done ON the system
∆E = q + w = 270. kJ + 365. kJ = 635 kJ of energy absorbed by the reaction
How hot or cold something is can be expressed numerically using the physical concept of temperature. Temperature is measured with a thermometer.
Different temperature scales, which traditionally established various reference points and thermometric materials, are used to calibrate thermometers. The most widely used scales are the Kelvin scale (K), which is mostly used in science, the Fahrenheit scale (°F), and the Celsius scale, also referred to as centigrade and denoted by the unit symbol °C. The kelvin is one of the seven base units in the International System of Units (SI).
The complete question is:
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1atm. The cylinder is also submerged in a large insulated water bath.
The temperature of the water bath is monitored, and it is determined from this data that 270.kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 365.kJ of work on the system during the reaction.
a) Is the reaction endo- or exo- thermic?
b) Does the temp. of the water bath go up or down?
c) Does the piston move in or out?
d) Does the reaction absorb or release energy?
e) How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits.
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rank the speed of sound in the following substances from slowest to fastest: steel 25°C air, 50°C air, and water. defend your predictions using the kinetic theory of matter.
The speed of sound in given substances from slowest to fastest: 25°C air, 50°C air, water, steel.
What are sound waves?Sound can transmit through liquids, gases, solids, and plasma as longitudinal waves, these are also known as compression waves. Sound waves need a medium to travel so they can be propagated through solids as longitudinal and transverse waves.
Longitudinal sound waves exhibit alternating pressure deviations leading to compression and rarefaction, while transverse waves exhibit alternating shear stress perpendicular to the propagation path.
Waves can cause matter to move up and down but can not carry along with them. As the temperature of the air increases the molecules start to vibrate faster eventually the speed of the sound increase.
The speed of sound is lowest in gases, faster in water, and fastest in steel (solid).
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need help asap please
I doiont know tbh
Explanation:
from your observations in step 7, what can you conclude about the relative equilibrium concentrations of cro42- (aq) ion in each of the solutions 0.1 m k2cr2o7 and 0.1 m k2cro4 before the ba(no3)2 solution is added?
Chromate anion is basically situated in the chromate salt. These oxoanions also possess the property of the oxidizing agent. The presence of chromate and dichromate anions results in chemical equilibrium. It is commercially used to prevent corrosion.This is because of Le Chatelier's Principle.
According to the Le Chatelier principle, when a dynamic equilibrium system is perturbed by a change in, say, pressure, temperature, or the concentration of products or reactants, the equilibrium will shift in the opposite direction to make up for the disturbance.
To further grasp this idea, consider the following example:
in the case of an equilibrium general reaction:
A (g) + B (g) <=> C (g) + D (g) (g) ΔH < 0 (it denotes an exothermic process) (it means an exothermic reaction)
The following is an example of this reaction:
A (g) + B (g) <=> Energy is released when an exothermic reaction occurs between C and D.
If the temperature increases or heat is added, the equilibrium will shift to the left because of the principle.
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the enthalpy of sublimation for a particular compound at 25.0 c is 32.4 kj/mol. the enthalpy of fusion for this compound at its melting point is 10.4 kj/mol. calculate the enthalpy of vaporization for this compound.
The enthalpy of vaporization for this compound is 22.0 kJ/mol.
What is vaporization?Vaporization is a process in which a liquid or solid is transformed into a gaseous state. It occurs when molecules in the liquid or solid absorb enough energy to break their intermolecular bonds and become a gas. This process can be carried out either through the application of heat or pressure, or through a process known as sublimation, which occurs when a solid is exposed to a vacuum.
ΔHₙ = ΔHₓ - ΔHₐ
Where, ΔHₙ = Enthalpy of vaporization
ΔHₓ = Enthalpy of sublimation (32.4 kj/mol)
ΔHₐ = Enthalpy of fusion (10.4 kj/mol)
ΔHₙ = 32.4 - 10.4
ΔHₙ = 22.0 kJ/mol
The enthalpy of vaporization for this compound is the difference between the enthalpy of sublimation and the enthalpy of fusion. Therefore, the enthalpy of vaporization for this compound is 22.0 kJ/mol.
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A kangaroo was 396 meters east of a lake. In 12 seconds, the kangaroo hopped one-third of the way to the lake at a constant velocity. What was the kangaroo's velocity?
The velocity of an object is the ratio of the distance to the time. The distance travelled by Kangaroo is 396 m in 12 seconds. So its velocity is 33 m/s.
What is velocity?Velocity is a physical quantity and it is the measure of distance travelled per unit time. Velocity is the rate of speed and it is a vector quantity.The velocity can be expressed in terms of m/s, Km/hr etc.
Mathematically, velocity is the ratio of distance to the time.
Given that, distance covered by kangaroo is 396 meters.
time taken = 12 s.
therefore, velocity can be calculated as follows:
velocity = distance/time
= 396 m / 12 s
= 33 m/s.
Therefore, the velocity of the kangaroo is 33 m/s.
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Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
N₂(g) + H₂(g) → NH3(g)
Hello,
I hope you and your family are staying safe and healthy!
To balance this chemical equation, we need to make sure that there is the same number of atoms of each element on both sides of the arrow.
We can start by looking at the nitrogen atoms. There is one nitrogen atom on the left side of the arrow, but there are two nitrogen atoms on the right side of the arrow. To balance the equation, we can add a coefficient of 2 in front of N₂ on the left side of the arrow:
2N₂(g) + H₂(g) → NH3(g)
Next, we can look at the hydrogen atoms. There are two hydrogen atoms on the left side of the arrow, but there is only one hydrogen atom on the right side of the arrow. To balance the equation, we can add a coefficient of 3 in front of NH3 on the right side of the arrow:
2N₂(g) + H₂(g) → 3NH3(g)
Now the equation is balanced, with two nitrogen atoms and two hydrogen atoms on each side of the arrow. The smallest possible whole number stoichiometric coefficients are 2 for N₂ and 3 for NH3.
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Happy Holidays!
which type of substance is fast acting, either immediately suffocating the victim or causing massive burning?
Substance is fast acting, either immediately suffocating the victim or causing massive burning is chemical weapons.
Chemicals used to intentionally kill or damage people through their poisonous qualities are known as chemical weapons. Chemical weapons also include weapons, apparatus, and other gear made expressly for turning hazardous substances into weapons.
What chemical weapon has the highest lethality?
What VX is VX is a nerve toxin that was created by humans for use in chemical warfare. The most dangerous and quickly acting of the known chemical warfare agents are nerve agents.
Basically, these weapons were just common munitions like grenades and artillery rounds that had well-known industrial chemicals added to them. Among the chemicals employed were chlorine, mustard gas, which causes terrible skin burns, and phosgene, a choking toxin.
The most critical effects are paralysis of the respiratory muscles and inhibition of the respiratory center. Ultimately, death results due to respiratory paralysis. If the concentration of the nerve agent is high, death is immediate.
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if the reaction yields 21.1l of nitrogen gas what mass of nan3 in grams would be required to produce this volume at stp?
if the reaction yields 21.1l of nitrogen gas, 40.81g mass of nan3 in grams would be required to produce this volume at stp
mass of NaN3 (g) = moles of NaN3 (ma) x molar mass of Na N3 (g/mol) = 0-678 mol 65 g/mol =40.81g. A chemical compound's molar mass is described as the weight of a sample of that chemical divided by the quantity of substance in that sample, which is the quantity of moles in that sample, evaluated in moles. The molar mass of a substance is a mass property, not a molecular property. It is the connection between pressure, volume, moles, and temperature. is the volume that one mole of the a chemical substance or a chemical compound takes up. As a result, at STP, the molar volume of a gas is 22.4 litres.
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When the dry ingredients of a cake are combined, what is the result?
atom
compound
mixture
element
When the dry ingredients of a cake are combined, the result is a mixture. Option 3.
What are mixtures?In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.
Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.
Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.
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Which equation is correct?
A) mechanical energy = kinetic energy-potential energy
B) mechanical energy = potential energy - kinetic energy
C) mechanical energy = kinetic energy + potential energy
D) mechanical energy = kinetic energy x potential energy
Pls help I’m dying
The equation that is correct is as follows: mechanical energy = kinetic energy + potential energy (option C).
What is mechanical energy?Mechanical energy is one of the forms of energy and it is the sum of the potential energy and kinetic energy of a body or system.
The potential energy is the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring).
On the other hand, kinetic energy is the energy possessed by an object because of its motion.
In other words, mechanical energy describes the energy of an object because of its motion or position, or both.
Therefore, option C is the correct equation.
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One of the wavelengths of light emitted by hydrogen atoms is 6.56 x 10–7 m. Calculate the frequency.
The frequency of the light emitted by hydrogen is equal to 4.57 Hz.
What are frequency and wavelength?The frequency of the wave can be defined as the number of oscillations of a wave per second. The frequency has S.I. units of s⁻¹ or Hertz.
The wavelength can be described as the distance between two adjacent crests on a wave.
The relation between frequency, wavelength, and speed of light (c) can be shown as:
c = νλ
Given, the wavelength of the light emitted by H-atom, ν = 6.56 × 10⁻⁷ m
The speed of light, [tex]c =3 \times 10^8\; m/s[/tex]
The frequency of the light emitted by hydrogen atoms can determine from the above-mentioned relationship:
ν= c/λ = 3 ×10⁸/6.56 × 10⁻⁷ = 4.57 Hz
Therefore, the frequency of the emitted light is equal to 4.57 Hz.
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allylic bromination of methylenecyclohexane would be expected to give two isomeric monobromination products. identify the other isomer. multiple choice a b c d
Two isomeric monobromination products should result from the allylic bromination of methylene cyclohexane, according to expectations. The final product will be 1-(bromomethyl)cyclohexene.
N-Bromosuccinimide, also known as NBS, is a chemical reagent utilized mostly in organic chemistry's electrophilic addition, electrophilic substitution, and radical substitution processes. It is regarded as an easy way to get bromine radicals. NBS interacts with the substance in an aqueous solution in alkenes to produce bromohydrins as the end result.
Allylic bromination is defined as the reaction employing NBS that results in the substitution of a bromine atom for hydrogens on a carbon next to a double bond.
Following drawing of the methylene cyclohexane extended structure, the reaction will be carried out using the reagent NBS.
The IUPAC name of the product is 1-(bromomethyl)cyclohexene.
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how many moles of chloride ions are there in a mixture of 2mol of barium chloride and 1 mol of pottassium chloride
The chloride ions in a mixture of 2mol of barium chloride and 1 mol of potassium chloride are 3 moles
What is Barium chloride?Generally, Barium chloride is an inorganic compound with the formula BaCl2. It is a white solid that is highly soluble in water. It is commonly used as a test for detecting the presence of sulfates in a solution and as a precursor to other barium compounds. Barium chloride is toxic if ingested, so it should be handled with caution.
There are a total of 3 moles of chloride ions in the mixture of 2 moles of barium chloride and 1 mole of potassium chloride.
Barium chloride contains 2 moles of chloride ions, and potassium chloride contains 1 mole of chloride ions, for a total of 2 + 1 = 3 moles of chloride ions.
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the natural abundance of calcium in the earth's crust is 3.4% by mass. how many calcium atoms are present in a 1.50 g sample of the earth's crust?
If calcium makes up 3.4% by mass of Earth's crust, the grams of calcium present if a sample of Earth's crust has a mass of 1.5 g is 0.051 g.
How to calculate mass?
The mass of an element in a sample can be calculated by multiplying the percent abundance of that element by the mass of sample.
According to this question, calcium makes up 3.4% by mass of Earth's crust. If a sample of Earth's crust has a mass of 1.5 g, the mass of calcium present can be calculated as follows:
mass of calcium = 3.4/100 × 1.5 g
mass of calcium = 0.051 g
Therefore, if calcium makes up 3.4% by mass of Earth's crust, the grams of calcium present if a sample of earths crust has a mass of 1.5 g is 0.051 g.
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Which of the following is NOT a correct formula unit for a salt made from main group elements?
Group of answer choices
KF
Na2S
Ca2O
Mg3N2
The formula unit of a salt that is not correct is [tex]Ca_{2} O[/tex] in option C.
What is a salt?A salt is almost always made up of a metal and a nonmetal element. The salts as we know them are mostly ionic in nature and they are known to be able to dissolve in solution when they are put into solution.
We know that the salt that they meant to show in option C is calcium oxide and the foregoing can not be the correct formula since both the calcium and the oxygen ions are divalent. The correct formula of the salt would be CaO.
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a government agency recommends that the amount of arsenic in drinking water should not be above 0.01 ppm. at this concentration, how many grams of arsenic would you expect to find dissolved in 1000 ml of pure water?
The formula for PPM =100 /1,000,000=0.01 PPM = 100 / 1 , 000 , 000 = 0.01 . i.e concentrations of arsenic should be less than 0.01 *1000 therefore it should be less than 10 ml for 1000ml of water.
This stands for "parts per million" and can alternatively be written as mg/L (milligrams per liter). The mass of a chemical or contamination per volume of water is the unit of measurement here. On a lab report, ppm or mg/L both signify the same thing. It provides information about a substance's density when it is dissolved in water. Examples include total alkalinity, calcium hardness, and free chlorine. A substance has a PPM of 1 if it makes up one millionth of the entire amount of water.
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A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving bat this speed and in this direction? Explain.
Answer: 8N (8 kg/ms")
Explanation: F= M*A
F= (2KG)*(4/MS") = 8N
How does the solubility of a gas in a solvent depend on pressure and temperature?
The solubility of a gas is directly proportional to the pressure and proportional to the temperature.
As we increase the pressure of a gas its collision frequency increases hence solubility increases as we decreases the pressure the solubility decreases. Collision frequency is defined as the collision of atoms on increasing pressure atoms start moving from one place to another. The relationship pressure is linear with solubility. It is defined by Henry's law.
The effect of temperature depends on the nature of solute and solvent.
Basically, as we increase the temperature in gas phase solubility also increases.
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which of the following is an intensive property? A. length, B. 45.0 C. Brittle D. 3.5 cm
The option that is an intensive property is brittle (option C).
What is an intensive property?Intensive property of a material is that property that does not depend on the amount or shape of the material, a property of the material at a specific point in space.
The properties of matter that do not depend on the size or quantity of matter in any way are referred to as an intensive property of matter.
Intensive properties of matter include the following: temperature, density, colour, melting and boiling point, etc., because they will not change with a change in size or quantity of matter.
Therefore, brittleness is an intensive property of a material.
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What is the IUPAC name for the compound N₂O3?
Answer: Dinitrogen trioxide
Explanation:
Which statement could be a specific theory
An explanation of a hypothesis that has been repeatedly tested in experiments and found to be correct is referred to be a scientific theory.
What is specific theory?Specific theory is defined as the theories that are limited to certain populations or specific sectors of practice, that concentrate on specific nursing phenomena, and that reflect clinical experience.
'A scientific theory is a well-supported explanation of some part of the natural world, based on a body of facts that have been repeatedly proven via observation and experimentation,' according to the Oxford Dictionary.
Thus, an explanation of a hypothesis that has been repeatedly tested in experiments and found to be correct is referred to be a scientific theory.
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cluster decay is a type of radioactivity like alpha decay, except instead of spitting out a helium nucleus, it expels something bigger. what is the atom resulting from uranium-235 (u) emitting a magnesium-28 (mg) nucleus? (write your answer in the standard u-235 format.)
A radioactive atom emits a cluster of neutrons and protons-235 heavier than an alpha particle in a process known as cluster decay.
Cluster decay, also known as heavy particle radioactivity or heavy ion radioactivity, is a very uncommon form of nuclear decay in which an atomic nucleus generates a small "cluster" of neutrons and protons, more than in an alpha particle but less than a typical binary fission fragment. The cluster size is also produced by ternary fission into three fragments. When the parent nucleus loses protons, it becomes the daughter nucleus, which has an atomic number Zd = Z + Ze and a mass number Ad = A Ae, where Ae = Ne + Ze. [1] For instance
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what has very good electrical conductivity
what will be the ph change when 20.0 ml of 0.100 m naoh is added to 80.0 ml of a buffer solution consisting of 0.166 m nh3 and 0.186 m nh4cl? (assume that there is no change in total volume when the two solutions mix.)
The pH change is +0.125 when 20.0 ml of 0.100 m naoh is added to 80.0 ml of a buffer solution consisting of 0.166 m nh3 and 0.186 m nh4cl.
Find the moles of NaOH and the moles of your initial acid and base, calculate the new molarities, and use the henderson-hasselbalch equation with your new concentrations. So I used the pKa of NH4Cl for the initial pH. (9.3). pH = 9.3 + log (0.169M/0.183M), and I measured 9.265, which is slightly different. Then, using M = mol/L 0.1M = x mol/0.02L, I calculated the moles of NaOH, which were 0.002. I used the same method to determine the moles of NH3 and NH4Cl, which were 0.0135 and 0.01464, respectively, after determining the moles of NaOH.When a strong base is added to a buffer, the acidic component reacts with the added base, releasing OH- ions and increasing the moles of acid and base, respectively. With this information, I added the number of moles of NaOH to the moles of NH3 0.0135 + 0.002 = 0.0155 moles and subtracted the number of moles of NaOH from the moles of NH4Cl 0.01464 - 0.002 = 0.01264 moles, then calculated the molarities by dividing the moles by (0.08 L + 0.02 L to account for the addition of NaOH), and calculated the new concentrations.[NH3] = 0.155M, [NH4Cl] = 0.1264M, now that we have the new concentrations of acid and base, substitute them into the H-H equation to get the new pH: pH = 9.3 + log (0.155/0.1264) = 9.39.9.39 - 9.265 = a pH change of +0.125.
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what is the difference between an ore vein and a disseminated deposit? which ones are easier to mine?
Ore veins and disseminated deposits are differ in terms of their size, shape, and distribution.
An ore vein is a large, continuous body of mineral deposits that are typically found in fractures or voids in rock formations. Ore veins are typically formed when minerals that are dissolved in water fill a void or crack in a rock formation. Ore veins are typically quite large and can be several meters in width and several kilometers in length. They are also typically found at depths of several hundred meters or more. Ore veins are generally easier to mine because they are more concentrated and can be more easily accessed through underground mining methods.
A disseminated deposit, on the other hand, is a type of mineral deposit that is dispersed or scattered throughout a larger rock formation. Disseminated deposits are usually smaller and less concentrated than ore veins and are typically found at shallower depths. They are often harder to mine because the minerals are not as concentrated and are more dispersed throughout the rock formation
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what is the maximum amount of flammable liquids that can be stored outside of a rated flammable cabinet in a laboratory?
The maximum amount of flammable liquids that can be stored outside of a rated flammable cabinet in a laboratory is 25 number of gallons.
To make certain flammable drinks are remoted from incompatible substances, they need to simplest be saved in a flammable cupboard this is used simplest for the garage of Class three Flammable Liquids. Extra care should be taken now no longer to take flammable drinks into regions of the laboratory which are the usage of incompatible substances.
The most quantity of flammable drinks that you could save in a single flammable cupboard is primarily based totally at the chemical's Flash Point and Boiling Point. No extra than 60 gallons of a Category 1, 2 or three flammable liquid or a hundred and twenty gallons of a Category four flammable liquid can be saved in a Flammable Safety Cabinet.No extra than 25 gallons of flammable drinks will be saved in a room outdoor of an permitted garage cupboard.
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An inflatable toy starts with 1.05 moles of air and a volume of 5.17 liters. When fully inflated, the volume is 8.00 liters. It the pressure and temperature inside the toy don't change, how many moles of air does the toy now contain?
1.62 moles of air the toy now contain. At STP, moles can be converted to gas volume and gas volume to moles using molar volume.
How to calculate no of moles ?An experimental gas law known as Avogadro's law or Avogadro-hypothesis Ampère's connects the volume of a gas to the amount of gas material present. The law is an instance of the ideal gas theory.
At constant temperature and pressure, volume is directly proportional to the number of moles of the gas.
The formula used for solving this type of problems is:
v1 / v2 = n1/ n2
let's plug in the given values in the formula:
5.17 / 8.00 = 1.05 m / n2
n2 = 8.00 * 1.05 / 5.17
n2 = 1.62 moles
So, the toy contains 1.62 moles of air when it's volume is 8.00 Liter.
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What mass of water is produced when 5.0 mol o2 is produced by this reaction?
Answer:
39.0
Explanation:
g two nuclei of 40ca (atomic number 20) undergo fusion to form a nucleus of 80 zr (atomic number 40). the total binding energy of 40ca is b. what would be the best estimate for the total binding energy of 80 zr?
The total binding energy of 80Zr is therefore approximately 4.58MeV.
What is isotopes?An isotope is an atom of a particular element that has a different number of neutrons than other atoms of that same element. This difference in the number of neutrons causes the isotopes to have different atomic masses. Isotopes of an element can be either stable or unstable. Stable isotopes are not radioactive and do not decay, while unstable isotopes are radioactive and undergo radioactive decay.
The total binding energy of 80Zr can be estimated using the mass defect of the two isotopes. According to the semi-empirical mass formula, the binding energy of a nucleus is related to its mass defect. The mass defect of the two nuclei can be calculated by subtracting the mass of the separate nuclei from the mass of the combined nucleus.
The mass of 40Ca is 39.96259 amu and the mass of 80Zr is 79.91652 amu. The combined mass of the two nuclei is 119.87911 amu.
The mass defect of the combined nucleus is therefore 119.87911 - 39.96259 - 79.91652 = 0.005 amu,
or 0.005 x 931.5 MeV/amu = 4.58MeV.
The total binding energy of 80Zr is therefore approximately 4.58MeV.
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what atomic or hybrid orbitals make up the sigma bond between and in acetic acid, ? ( is the second carbon in the structure as written. is the first oxygen in the structure as written.) orbital on orbital on what is the approximate bond angle? angle
(a) sp2- hybrid orbital of C1 and p-orbital of O1 , because, central atom i.e. carbon has sp2-hybridization and in surrounded oxygen atom last electrons enters in p-orbital. (b) 1200 bond angle, because shape is trigonal planar.
Atomic orbitals are generally specific through a mixture of numerals and letters that constitute precise residences of the electrons related to the orbitals—for example, 1s, 2p, 3d, 4f. The numerals, referred to as primary quantum numbers, imply strength degrees in addition to relative distance from the nucleus. The simple names s orbital, p orbital, d orbital, and f orbital refer to orbitals with angular momentum quantum number ℓ = 0, 1, 2, and 3 respectively.
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