17.0g of potassium acetate is dissolved in 250.mL of a 0.30M aqueous solution of sodium chromate. The final molarity of acetate anion in the solution is 0.59 M.
The term "molar concentration" refers to the amount of a substance in a solution represented as a percentage of its volume. It is also used to refer to molarity, quantity concentration, or substance concentration. The most common unit used in chemistry to express molarity is the number of moles per liter, represented by the unit sign mol/L or mol/dm3 in SI units. One molar, or 1 M, of a solution's concentration is defined as one mol/L. Molarity is a unit of concentration used to describe chemical solutions (M). It is the number of moles of the solute in one liter of solution. This is not the same as the liters of solvent, to be clear (a common mistake). Despite being a useful unit, molarity has one fundamental flaw. Because temperature affects a solution's volume, it does not remain constant when it varies. Because you cannot directly measure solute in moles, you usually convert grams of solute to moles and then divide this amount by liters of solution.
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given the reaction: 234 91 pa x 0 -1e when the equation is correctly balanced the nucleus represented by x is
The reaction is given : ²³⁴Pa₉₁ -----> X + ⁰e₋₁ , the equation is balanced and the nucleus represented by X is ²³⁴U₉₂.
The balanced reaction is given as :
²³⁴Pa₉₁ -----> X + ⁰e₋₁
This reaction is the balanced reaction and X is represented the nucleus and is given as : ²³⁴U₉₂.
The given reaction is the nuclear reaction. the nuclear reaction is the reaction in which the nuclides are produced by the collision between the two atoms nuclei. the nuclear reaction are of the two types the nuclear fission and the nuclear fusion reaction. the nuclear fission is the splitting of the large nuclei in to the smaller ones.
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. What happens when metals react with water?
Answer:
Metals react with water to form oxides or hydroxides and release Hydrogen gas
Explanation:
2 HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O
Given: 151.75 grams H2O produced
Wanted: grams of HNO3 reacted?
The mass (in grams) of HNO₃ that reacted to produce 151.75 grams of H₂O is 531.125 grams
How do I determine the mass of HNO₃ that reacted?We shall consider the balanced equation to obtain usefull information.
2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O
Molar mass of HNO₃ = 63 g/molMass of HNO₃ from the balanced equation = 63 × 2 = 126 gMolar mass of H₂O = 18 g/molMass of H₂O from the balanced equation = 2 × 18 = 36 gFrom the balanced equation above,
36 grams of H₂O were produced from 126 grams of HNO₃
With the above information, we can determine the mass of HNO₃ that reacted to produce 151.75 grams of H₂O. Details below:
From the balanced equation above,
36 grams of H₂O were produced from 126 grams of HNO₃
Therefore,
151.75 grams of H₂O will be produce from = (151.75 × 126) / 36 = 531.125 grams of HNO₃
Thus, the mass of HNO₃ that reacted is 531.125 grams
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Determine the structure of C6H10, which upon oxidation gives acetic and isobutyric acid
Answer:CH
3
CH
2
CH
2
C≡C−CH
3
Explanation:
A rigid 11.7 L sealed vessel containing 3.3 mol O2(g), 1.6 mol CH4(g) and 2.3 mol of He(g)
has an internal temperature of 78oC.
a. Calculate the partial pressure of each gas.b. What is the total pressure in the vessel?
c. Find the mole fraction of each gas in the vessel.d. A lab technician ignites the mist in the flask and the methane gas combusts in oxygen
to form carbon dioxide and water. Find the mole fraction of each gas in the mixture
after the reaction.
a) Partial pressures is Po2 = 8.13 atm,Pch4=3.94atm,Phe = 5.6 atm,B) Total pressure= 17.73 atm, C) mole fraction are Хо2 =0.46, xch4=0.22, xhe=0.32.
mole fraction are Хo2 =3.3/3.3+ 16 + 2.3,Хо2 =0.46, xch4=0.22, xhe=0.32. Xo2 = no2/no2 + nch4 + nhe, total pressure = 8.13+3.94+5.6=17.73 atm. The pressure applied by a solitary gas in a combination is did refer to as its partial pressure. Presuming we get a combination of ideal gas law, we could use ideal gas equation to resolve issues involving gases inside a mixture. Partial Pressure can be defined as if a canning jar filled with far more than one gas, evey gas enforces pressure. The pressure of any gas enclosed within in the container is regarded to as its partial pressure. The number of molecules of a special component in a mix divided by the total amount of moles in the given medium is symbolised by the mole fraction. It's a means of expressing a solution's concentration.
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What is an example of a change in the genetic traits of an organism due to human influence? OA. Humans breed dogs to be smaller and more friendly. B. Humans train dolphins to perform tricks for audiences at an aquarium. C. Humans destroy a tree frog's habitat, and the tree frogs become extinct. D. Humans feed bears, and the bears begin to enter campsites to look for food.
An example of human intervention in the genes is; humans breed dogs to be smaller and more friendly. Option A
What is the gene?We know that the gene is the unit of inheritance that can be found in the chromosome of the organism. The genes that the organism does have is what would tell must the observed traits of the organism and this is called the phenotype of the organism.
We know that human's do have an impact with the fact that the genes can spread in an organism. In many cases, we can see the alteration of the genes when we deal with the genetic make up of the pets.
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One of the most widely used isotopes in medical diagnostics is technetium-99m (the m indicates that it is a metastable isotope). Write the symbol for this isotope, indicating both mass number and atomic number. Express your answer as an isotope.
Atomic number of Technetium is 43, Mass number is 99 and symbol is Tc ,hence symbol of isotope is 99 m43 Tc
General representation of atom is AZ X
Where , A is mass number , Z is atomic number and X is symbol of element. Atomic number of Technetium is 43, Mass number is 99 and symbol is Tc ,hence symbol of isotope is 99 m43 Tc ,Where m stands for meta stable.
A chemical element with the atomic number 43 and the symbol Tc is known as technetium. It is the lightest element whose radioactive isotopes are all present. Technetium is a synthetic element that is created in abundance. The most prevalent source of naturally occurring technetium is uranium and thorium ores, where it spontaneously fissions as a byproduct, while molybdenum ores produce it as a byproduct of neutron capture. This crystalline, silvery-gray transition metal in group 7 of the periodic table is sandwiched between rhenium and manganese, and its chemical characteristics fall somewhere in the middle of the two nearby elements. Only in traces, 99Tc is the most prevalent naturally occurring isotope.
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Identify the options below that are results of decreasing the temperature of a system that includes an exothermic reaction in the forward direction. A. The concentration of the reactants increases. B. The concentration of the products increases. C. The equilibrium constant decreases. D. The equilibrium shifts toward the products.
If the reaction is exothermic as described, a rise in temperature will thus trigger the opposite reaction, which will result in a decrease in the amount of the products and an increase in the number of reactants. The reverse outcome will occur if the temperature is lowered.
B. The concentration of the products increases.
A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically produce heat. Exergonic reaction, which the IUPAC defines as "... a reaction for which the overall standard Gibbs energy change G is negative," is frequently mistaken with the phrase.
Because "H" contributes significantly to "G," a strongly exothermic process is typically also exergonic. Exothermic and exergonic chemical reactions make up the majority of the impressive demonstrations in schools.
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how do oxygen molecules interact differently with the systems and cells when you have asthma?
Answer:
In individuals with asthma, the airways (bronchial tubes) that carry air in and out of the lungs become narrowed, swollen, and inflamed due to an overactive immune response. This can lead to difficulty breathing, wheezing, coughing, and other symptoms.
During an asthma attack, the muscles around the airways may become tight and the lining of the airways may produce excessive mucus, further narrowing the airways and making it difficult for oxygen to reach the cells in the body. This can lead to low oxygen levels in the blood and cause symptoms such as shortness of breath and chest tightness.
In addition to these physical changes in the airways, individuals with asthma may also have an overactive immune response to certain triggers, such as allergens or irritants, which can further worsen inflammation and airway narrowing.
Treatment for asthma typically involves using medications to control inflammation and relax the muscles around the airways, as well as avoiding triggers that can worsen symptoms. By properly managing their asthma, individuals with the condition can often lead normal, active lives.
Explanation:
The tubes that carry air into and out of the lungs become irritated and constricted in people with asthma. This can make it difficult for air to enter and exit the lungs, which can cause symptoms including coughing, wheezing, and breathing problems.
Being less able to enter the lungs and reach the body's cells is one-way oxygen molecules can interact differently with the systems and cells in people with asthma. It is more difficult for oxygen to enter the lungs when the airways are constricted, which can result in a reduction in the amount of oxygen reaching the body's cells. This may cause symptoms including trouble breathing and difficulty engaging in physical activity.
In people with asthma, oxygen molecules can also affect the cells and systems in different ways by inducing an immunological reaction. When allergens or pollutants are breathed by asthmatic patients, their immune systems may be overly sensitive to them and may respond inappropriately. This may result in the release of inflammatory substances, which may further constrict the airways and hinder the absorption of oxygen by the lungs.
Inflammation and immune system overactivity can generally disrupt how oxygen molecules interact with the body's processes and cells in people with asthma, which can cause breathing problems and other symptoms.
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Which if these options best describes the diagnostic cleavage that is typical of the mica group of minerals (which includes muscovite and bietet A) Three perpendicular cleavage planes B) Two cleavage planes intersecting at 90° C) Two cleavage planes intersecting at 120 D) A single planar cleavage
D ) The answer that best depicts the diagnostic cleavage that is typical of the mica group of minerals which include muscovite and bietet is a single, planar cleavage .
Cleavage is the splitting of minerals along natural planes of weakness
When there is only one cleavage plane, a single, planar cleavage known as the basal or pinacoidal cleavage takes place. cleaved at the base of the graphite. Mica (like muscovite or biotite) has basal cleavage, that's why mica can be peeled into thin sheets.
So single planar cleavage is answer of this question.
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Calculate the number of moles of carbon dioxide gas if the volume is 2.0 L, the pressure is 2.0 atm, and the temperatue is 410 K.
Use three significant figures in your answer.
mol
Taking into account the ideal gas law, the number of moles of carbon dioxide is 0.119 moles.
Ideal gas lawAn ideal gas or theoretical gas is a set of separate gaseous molecules separated from each other in such a way that no intermolecular forces are exerted between them.
The ideal gas condition normally occurs at low pressures and high temperatures, which allows each particle to be far from each other so that they do not interact.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
Where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. The numerical value of R will depend on the units in which the other properties are worked.n is the number of moles of the gas. Number of moles of carbon dioxideIn this case, you know:
P= 2 atmV= 2 LT= 410 KR= 0.082 (atmL)÷(molK)n= ?Replacing in the ideal gas law:
2 atm× 2 L= n×0.082 (atmL)÷(molK)× 410 K
Solving:
[2 atm× 2 L]÷ [0.082 (atmL)÷(molK)× 410 K]= n
0.119 moles= n
Finally, the number of moles is 0.119 moles.
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Helen goes to the doctor and has a thyroid test done. She receives 20 grams of radioactive iodine. After 8 hours, 10 grams of the iodine have broken down. After 16 hours, there are 5 grams of iodine left.
What is the half-life of the radioactive iodine?
8 hours
8 hours is the half-life of the radioactive iodine. The entire body is exposed to radiation risks from gamma rays. They can swiftly get through defences that alpha and beta particles can stop.
Like skin and clothing. Because of their powerful penetrating power, gamma rays may require several inches of a heavy substance, like lead, or even several feet of concrete, to be stopped. During radioactive decay, an atom's nucleus may emit gamma rays. They can easily penetrate the human body and travel tens of yards or more through the air. It takes a radioactive heavy, dense material, such several inches of lead or concrete, to shield this particularly penetrating form of ionising radiation.
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with reference to compound a below, label each compound as an identical molecule, an isomer, a resonance structure, or neither.
Label for each of the compounds given in the question are: 1) Isomer, 2) Isomer, 3) Resonance Structure, 4) Isomer 5) Neither.
A group of two or more Lewis structures known as resonance structures describe the electronic bonding of a single polyatomic species, including fractional bonds and fractional charges. The number of electrons in resonance structures should be constant; do not add or subtract any electrons. (Count the electrons to determine their number). Every resonance structure complies with the standards for writing Lewis Structures. Structure hybridization must be constant. By cyclically moving elections, it is possible to depict the two resonance configurations of the benzene ring. Multiple resonance structures can be found in conjugated double bonds.
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draw the structure of a compound with the empirical formula c5h8o that gives a positive iodoform test and does not decolorize permanganate.
A ring of C3H5 makes up the structure of a chemical with the empirical formula C5H8O that passes the iodoform test and does not discolor permanganate.
C5H8O → 1/2 (C5H12-C5H8) = 1/2(4)=2 carbons CH3C=O
No C=C after a negative permanganate test
Has a C=O bond
Methyl ketone as it tested positive for iodoform
C3H5 = ring
A cyclopropyl group is a chemical structure produced from cyclopropane that may take part in cycloadditions and rearrangements of cyclopropane in organic processes. The group contains a chemical link from each of the three carbons to both of the other two, and its empirical formula is C3H5.
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Which one of the following types of radiation has the shortest wavelength, the greatest energy, and the highest frequency? a. Ultraviolet radiation. b. Infrared radiation. c. Visible red light. d. Visible blue light.
Among the given radiations, the one with shortest wavelength, highest energy and highest frequency is ultraviolet radiation.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of different radiations in the order of decreasing wavelength or increasing frequency. The wavelength of an electromagnetic wave is inversely proportional to the frequency and energy.
Thus, as the frequency increases energy of the wave increases and wavelength decreases. The order of waves in the decreasing order of wavelength is, radio waves, microwaves, infrared, visible, ultraviolet, x-ray and gamma ray.
Thus, among the given radiation, the highest energy, highest frequency and shortest wavelength is ultraviolet radiation.
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Question 20 (1 point) ✓ Saved A short circuit can cause ________ because there is nothing in the circuit to limit the current and absorb the electrical energy. Heat builds up quickly in the wire and power supply. (Lesson 4.05) an explosion a release of harmful chemicals a fire All of the above
A short circuit can cause giant spark ,because there is nothing in the circuit to limit the current and absorb the electrical energy. Heat builds up quickly in the wire and power supply. (Lesson 4.05) an explosion a release of harmful chemicals a fire All of the above
What is Circuit?
The point where the electrons enter the electrical circuit is known as the source, and the point where they depart is known as the return. Let's do a little experiment; you'll require the following:
Electrical tape, wire, and electric bulbs
power source
Only when there is at least one closed loop running from the positive to the negative end of the circuit is it considered complete. This is the most basic type of electrical circuit. A television's internal circuit is more intricate and made up of several parts
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Which of the following characteristics was NOT included in Dmitri Mendeleev's periodic table?O distribution of elements determined by electron configurationO heavier elements placed in rows closer to the bottom of the tableO elements arranged by increasing atomic massO elements placed in columns based on chemical properties
Mendeleev's periodic table includes all the elements that were known at the time.
The rows of the table, were called periods and each period contained eight elements that increased in atomic mass from left to right.
The columns of the table, called groups, contained elements with similar properties.
The special this about this table was, the gaps for predicted elements were left.
In this question, we are given with four statements and are asked to determine, which of the following statement is not true regarding Dmitri Mendeleev's periodic table.
distribution of elements determined by electron configurationheavier elements placed in rows closer to the bottom of the tableelements arranged by increasing atomic masselements placed in columns based on chemical propertiesOut of these four options, option number 1 is correct as the statement distribution of elements determined by electron configuration is not true regarding Mendeleev's periodic table.
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Before the Contraction CycleThe contraction cycle is the repeating sequence of events that causes the process of the sliding filament mechanism, and it is made up of FOUR phases- The SR releases calcium ions (Ca2+) into the sarcoplasm- There, they bind to troponin. Troponin then moves tropomyosin away from the myosin-binding sites on actin
True. Calcium ions (Ca2+), which are released by the SR, bind to troponin in the sarcoplasm. Then, troponin displaces tropomyosin from the actin myosin-binding sites.
Troponin levels that are extremely high indicate the onset of a heart attack. Within six hours after a heart attack, the majority of individuals experience elevated troponin levels. Mostly everyone who has experienced a cardiac arrest will still have elevated levels after 12 hours. After a heart attack, troponin levels may continue to rise for 1 to 2 weeks. For instance, the typical levels for troponin I is 0 to 0.04 ng/mL, whereas the normal range for rising cardiac troponin (hs-cTn) is less than 14 ng/L. Increases in troponin levels may result from other kinds of heart damage. One of these is sinus arrhythmia.
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the decomposition of h2o2 is represented by the equation above. the reactuin us thermodynamically favorable
The decomposition of H2O2 is represented by the equation above. the reaction us thermodynamically favorable 4H₂O₂ → 4H₂O + 2O₂
The following diagram illustrates how hydrogen peroxide decomposes chemically;
2H₂O₂ → 2H₂O + O₂
As a result, one oxygen molecule and two water molecules result from the breakdown of two hydrogen peroxide molecules.
Numerous chemical substances spontaneously react with molecular oxygen to produce peroxides in the form of free radicals.
Given that there are four hydrogen peroxide molecules breaking down in the diagram, we have;
4H₂O₂ → 4H₂O + 2O₂
The results of the breakdown of the four molecules of hydrogen peroxide are depicted in the accompanying diagram.
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Balance this equation, AlCl3 + NaOH -
Al(OH)3 + Nacl
The balanced chemical equation for the given chemical reaction is AlCl₃ + 3 NaOH [tex]\rightarrow[/tex]Al(OH)₃ +3 NaCl.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Redox reactions can be predicted because less reactive ions will always receive electrons from metals that are more active.
true or false
False, The metals have been oxidized because they have lost electrons to oxygen; oxidation is hence the loss of electrons.
How do redox reactions take place?The exchange of electrons between an electron donor (which oxidizes) and an electron acceptor occurs in oxidation-reduction or redox processes (that becomes reduced). While reducing agents are quick to give up electrons, oxidizing agents have a high desire for them.
What are redox reactions used for primarily?Because they are the primary sources of energy on this planet, both natural and man-made (or "redox"), oxidation-reduction reactions are significant. Large amounts of energy are typically released when molecules undergo oxidation through the elimination of hydrogen or in conjunction with oxygen.
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Which of the following is an observation of a chemical property?
Ozinc reacts with hydrochloric acid
O
O water boils at 100°C.
Osand paper is roughly textured
density of wood is 0.51 g/cm³
Zinc reacts with hydrochloric acid is the correct observation of a chemical property and the right response to the question above.
Equation:
Zn +2HCL → ZnCl2 +H2
Balanced equation:
Zn +2HCL → ZnCl2 +H2
Atomic number 30 and the letter Zn identify zinc as a chemical element. When the oxidation is eliminated, zinc becomes shiny-greyish and becomes a somewhat brittle metal at normal temperature.
Zinc is a crucial trace element for all living things, including humans, animals, plants, and microbes. After iron, it is the trace metal found in humans in the second-highest concentration. As a crucial cofactor for several enzymes, zinc is also a crucial vitamin for development. Many disorders can be caused by a zinc shortage. slowing in growth, infection susceptibility, and diarrhea are among effects of deficiency in children. . Consuming too much zinc can result in copper shortage, ataxia, and sluggishness.
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please name and briefly describe 2 remedies a seller has under the ucc when the buyer has breached and the seller still possesses the goods.
2 remedies a seller has under the UCC when the buyer has breached and the seller still possesses the goods are that he can cancel the contract or withhold the delivery.
By contract, what did you mean?
An agreement between parties that establishes legal duties for both parties is known as a contract. Mutual consent, demonstrated by a valid offer and acceptance, sufficient consideration, capability, and legality are the fundamental components needed for the agreement to be a legally enforceable contract.
Contract with example: What is it?
A commitment made by one party to another that they will or won't take a particular action in the future. As an illustration, I'll offer you $3,500 to buy your car. An acceptance.
Therefore, it usually reflects the conditions of the offer—an indication, through speech or action, that both parties accept the terms of the contract.
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Consider the half reactions one more time. Will the reaction as written here occur spontaneously?
Fe2+ (aq) +2 e-→ Fe(s) E° = -0.447 V
Cu2+ (aq) +2 e-→ Cu(s) E° = 0.342 V
Fe2+ (aq) + Cu(s) → Cu²+ (aq) + Fe(s)
yes or no or need more information
To solve such we need to have concept of spontaneity. The terms "feasible" and "likely" are both used to describe spontaneous processes. Therefore, second reaction will occur spontaneously.
What is spontaneity?The word "spontaneity" refers to a process's viability. A process is referred to as spontaneous if it can occur either on its own or as the result of some initiation under a certain set of circumstances. In other terms, a spontaneous process is one that may happen on its own, without any outside intervention.
For a reaction to be spontaneous, the value for ΔG should be negative and for that cell potential should be positive value according to following equation.
ΔG=-nFE
ΔG = Gibbs's free energy
E= cell potential
F= 96500
n= number of electron
Therefore, second reaction will occur spontaneously.
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High-purity benzoic acid (C6H₂COOH; AHxn for combustion = -3227 kJ/mol) is used as a standard
for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity = 1365 J/°C)
that contains exactly 1.240 kg of water. What temperature change is observed?
°℃
According to the given statement 5 °C temperature change is observed.
How does a calorimeter function and what is it?The variation in heat is measured by a calorimeter. A metal water container placed above an exhaust gases serves as the basic component of a calorimeter. The amount of water's temperature change is measured using a thermometer.
Briefing:The calorimeter burns a 1.221g sample.
The calorimeter contains 1.240 kg of water .
The calorimeter has a heat capacity of 1365 j/°C.
∆H rxn = -3227 kj/mol of benzoic acid
Given: 1.221 g is the mass of the benzoic acid
Benzoic acid's molecular weight is 122.12 g/mol.
122.12 g benzoic acid = 1 mol
1.221 g benzoic acid =1.221/122.12= 0.0099 moles
When burned, 1 mol of benzoic acid releases 3227 kj of energy.
Burning 0.0099 moles of benzoic acid produces energy
= 3227kj×(0.0099mols)/1 mol =32.2647 kj =32264.7 j
The calorimeter absorbed thermal energy
= 1365 j/C ×T
Water absorbs heat
= m× C× T
= 1240 g( 4.18 j/gC ) ×T
= 5183.2j/C×T
the total amount of heat absorbed
= 1365T + 5183.2T
=6548.2T
6548.2T=32264.7
T= 4.92 deg.C
T= 5 °C
The result is a 5 °C temperature change.
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Voltaic cells are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow
spontaneously.
true or false
Answer: True. Voltaic cells, also known as galvanic cells, are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow spontaneously. Redox reactions involve the transfer of electrons from one species to another, and the flow of electrons through a circuit can be used to do work, such as powering an electric motor or a lightbulb. The potential difference between the two half-cells in a voltaic cell is called the cell potential, and it determines the direction and magnitude of the flow of electrons.
Explanation:
the equilibrium constant of a redox reaction can be calculated from the standard reduction potentials of involved redox couples at given temperature.
The Nernst equation and the link between the standard cell potential and free energy can be used to determine the equilibrium constant of the redox process in an electrochemical cell.
The ratio of the product concentration to the reactant concentration is the equilibrium constant. a fixed value for a certain reaction at a specific temperature. The letter "c" denotes the expression of the equilibrium constant in terms of concentrations.
The standard cell potential, temperature, reaction quotient, and the cell potential of an electrochemical cell are all related by the Nernst equation. The Nernst equation can be used to determine the cell potentials of electrochemical cells even under unusual circumstances.
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Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to
graphite so slowly that the enthalpy change of the process must be obtained indirectly. Determine A
Hrxn for
C(diamond)
C(graphite)
with equations from the following list:
(1) C(diamond) + O₂(g) → CO₂(g)
(2) 2 CO₂(g) → 2 CO(g) + O₂(g)
(3) C(graphite) + O₂(g) → CO₂(g)
(4) 2 CO(g) → C(graphite) + CO₂(g)
AHoverall
KJ
AH = -395.4 kJ
AH= 566.0 kJ
AH=-393.5 kJ
AH = -172.5 kJ
The ΔH of the reaction for the formation of graphite from diamond is equal to -1.9 KJ/mol.
What is the heat of the formation of the reaction?The heat of formation can be described as the amount of heat absorbed or evolved when 1 mole of a substance is formed from its constituent elements, each substance being in its normal physical state.
We have to rearrange the provided equations in a way in which all molecules of O₂ and CO₂ can be eliminated:
2C (diamond) + 2O₂ (g) → 2CO₂ (g) ΔH₁= 2 × (-395.4 KJ)
2 CO₂ (g) → 2 CO(g) + O₂(g) ΔH₂ = 566.0 KJ
CO₂(g) → C (graphite) + O₂(g) ΔH₃= - 1 × (-393.5 KJ)
2CO (g) → C (graphite) + CO₂(g) ΔH₄= -172.5 KJ
When we eliminate the molecules that appear both in reactants and products, the total chemical reaction is the following:
2C (diamond) → 2C (graphite)
ΔH (total) = ΔH₁ + ΔH₂ + ΔH₃ + ΔH₄
ΔH (total) = 2 × (-395.4 KJ) + 566.0 KJ + (-1 × (-393.5 KJ)) - 172.5 KJ
ΔH (total) = 347.2 KJ
This is for 2 mol of C (diamond) which is converted into 2 mol of C (graphite). To find ΔH for the reaction of 1 mol C (diamond) to 1 mol (graphite) we have to divide it into 2:
ΔH = - 3.8/2 = -1.9 KJ/mol
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Which of the following statements is/are true? I. The melting points of molecular solids are lower than those of ionic solids because the bonds ecular solids are weaker than those in ionic solids. II. The shape of molecule does not influence its melting point or boiling point O II only O neither I nor II O I only O both I and II
Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.
Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.
These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.
In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.
This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.
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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.
Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.
These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.
In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.
This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.
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A retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 J. For light of 600-nm wavelength, how many photons does the correspond to?
The number of photons that are in the light is obtained as 133 photons.
What is the number of the photons?We know that the photons are the particles of light and that we can be able to obtain the energy of the photons. Let us note that the photons also have a given wavelength which can be able to calculate with the formula for the energy of the photon.
An adaptation of the Plank's equation that has to do with the wavelength of the wave can be given by the use of the formula;
E = nhc/λ
E = energy
n = Number of photons
h = Plank's constant
c = Speed of light
λ = wavelength
Then we have;
n = Eλ/hc
n = 4.0 x 10^-17 * 600 * 10^-9/6.6 * 10^-34 * 3 * 10^8
n = 2.4 * 10^-23/1.98 * 10^-25
n = 1.33 * 10^2
n = 133 photons
There are 133 photons present
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