Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Textbook Question
Chapter 17, Problem 2ALQ
For a liquid, which would you expect to be larger, ᅀSfusion or ᅀSevaporation? Why?
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8. What is the symbol for energy/heat flow in the field of thermochemistry?
O Hf
E
H
15. What is Hess's Law? How is it used? Why is it important in chemistry? Explain your ideas and provide
at least one relevant example to support your answer.
Given these reactions, where X represents a generic metal or metalloid
1) H, (g) + 0,(g) → H,0(g)
AH1 = -241.8 kJ
2) X(s) + 2 Cl,(g) → XCl,(s)
AH2 = +475.9 kJ
3) H,(g) + CL,(g)
HCl(g)
АНз 3 —92.3 kJ
→
4) X(s) + O,(g) –→ XO,(s)
AH4 = -748.7 kJ
5) Н, О(2) — н,00)
AH5 = -44.0 kJ
what is the enthalpy, AH, for this reaction?
XCI, (8) + 2H,О() — ХО,(8) + 4 HCI(g)
Chapter 17 Solutions
Chemistry
Ch. 17 - Define the following: a. spontaneous process b....Ch. 17 - What is the second law of thermodynamics? For any...Ch. 17 - What determines Ssurr for a process? To calculate...Ch. 17 - The free energy change, G, for a process at...Ch. 17 - What is the third law of thermodynamics? What are...Ch. 17 - What is the standard free energy change, G, for a...Ch. 17 - If you calculate a value for G for a reaction...Ch. 17 - Consider the equation G = G + RT ln(Q). What is...Ch. 17 - Even if G is negative, the reaction may not occur....Ch. 17 - Discuss the relationship between wmax and the...
Ch. 17 - For the process A(l) A(g), which direction is...Ch. 17 - For a liquid, which would you expect to be larger,...Ch. 17 - Gas A2 reacts with gas B2 to form gas AB at a...Ch. 17 - What types of experiments can be carried out to...Ch. 17 - A friend tells you, Free energy G and pressure P...Ch. 17 - Prob. 6ALQCh. 17 - Predict the sign of S for each of the following...Ch. 17 - Is Ssurr favorable or unfavorable for exothermic...Ch. 17 - At 1 atm, liquid water is heated above 100C. For...Ch. 17 - Prob. 10ALQCh. 17 - The synthesis of glucose directly from CO2 and H2O...Ch. 17 - When the environment is contaminated by a toxic or...Ch. 17 - Entropy has been described as times arrow....Ch. 17 - Human DNA contains almost twice as much...Ch. 17 - A mixture of hydrogen gas and chlorine gas remains...Ch. 17 - Consider the following potential energy plots: a....Ch. 17 - Ssurr is sometimes called the energy disorder...Ch. 17 - Given the following illustration, what can be said...Ch. 17 - The melting point for carbon diselenide (CSe2) is...Ch. 17 - The third law of thermodynamics states that the...Ch. 17 - The deciding factor on why HF is a weak acid and...Ch. 17 - List three different ways to calculate the...Ch. 17 - What information can be determined from G for a...Ch. 17 - Monochloroethane (C2H5Cl) can be produced by the...Ch. 17 - Consider the following relationships: G = 1, H =...Ch. 17 - Consider the reaction N2O2(g) 2NO2(g) where...Ch. 17 - At 1500 K, the process I2(g)2I(g)10atm10atm is not...Ch. 17 - Which of the following processes are spontaneous?...Ch. 17 - Which of the following processes are spontaneous?...Ch. 17 - Table 16-1 shows the possible arrangements of four...Ch. 17 - Consider the following illustration of six...Ch. 17 - Consider the following energy levels, each capable...Ch. 17 - Redo Exercise 29 with two particles A and B, which...Ch. 17 - Choose the substance with the larger positional...Ch. 17 - Which of the following involve an increase in the...Ch. 17 - Predict the sign of Ssurr for the following...Ch. 17 - Calculate Ssurr for the following reactions at 25C...Ch. 17 - Given the values of H and S, which of the...Ch. 17 - At what temperatures will the following processes...Ch. 17 - Ethanethiol (C2H5SH; also called ethyl mercaptan)...Ch. 17 - For mercury, the enthalpy of vaporization is 58.51...Ch. 17 - For ammonia (NH3), the enthalpy of fusion is 5.65...Ch. 17 - The enthalpy of vaporization of ethanol is 38.7...Ch. 17 - Predict the sign of S for each of the following...Ch. 17 - Predict the sign of S for each of the following...Ch. 17 - For each of the following pairs of substances,...Ch. 17 - For each of the following pairs, which substance...Ch. 17 - Predict the sign of S and then calculate S for...Ch. 17 - Predict the sign of S and then calculate S for...Ch. 17 - For the reaction C2H2(g)+4F2(g)2CF4(g)+H2(g) S is...Ch. 17 - For the reaction CS2(g)+3O2(g)CO2(g)+2SO2(g) S is...Ch. 17 - It is quite common for a solid to change from one...Ch. 17 - Two crystalline forms of white phosphorus are...Ch. 17 - Consider the reaction 2O(g)O2(g) a. Predict the...Ch. 17 - Hydrogen cyanide is produced industrially by the...Ch. 17 - From data in Appendix 4, calculate H, S, and G for...Ch. 17 - The major industrial use of hydrogen is in the...Ch. 17 - For the reaction at 298 K, 2NO2(g)N2O4(g) the...Ch. 17 - At 100C and 1.00 atm, H = 40.6 kJ/mol for the...Ch. 17 - For the sublimation of iodine at 25C I2(s) I2(g)...Ch. 17 - Given the following data:...Ch. 17 - Given the following data:...Ch. 17 - For the reaction SF4(g)+F2(g)SF6(g) the value of G...Ch. 17 - The value of G for the reaction...Ch. 17 - Consider the reaction...Ch. 17 - Consider the reaction 2POCl3(g)2PCl3(g)+O2(g) a....Ch. 17 - Using data from Appendix 4, calculate H, S and G...Ch. 17 - Consider two reactions for the production of...Ch. 17 - Using data from Appendix 4, calculate G for the...Ch. 17 - Using data from Appendix 4, calculate G for the...Ch. 17 - Consider the reaction 2NO2(g)N2O4(g) For each of...Ch. 17 - Consider the following reaction:...Ch. 17 - One of the reactions that destroys ozone in the...Ch. 17 - Hydrogen sulfide can be removed from natural gas...Ch. 17 - Consider the following reaction at 25.0C:...Ch. 17 - The standard free energies of formation and the...Ch. 17 - Calculate G forH2O(g)+12O2(g)H2O2(g) at 600. K,...Ch. 17 - The Ostwald process for the commercial production...Ch. 17 - Cells use the hydrolysis of adenosine...Ch. 17 - One reaction that occurs in human metabolism is...Ch. 17 - Consider the following reaction at 800. K:...Ch. 17 - Consider the following reaction at 298 K:...Ch. 17 - Consider the relationship In(K)=HRT+SR The...Ch. 17 - The equilibrium constant K for the reaction...Ch. 17 - A reaction has K = 1.9 1014 at 25C and K = 9.1 ...Ch. 17 - Using Appendix 4 and the following data, determine...Ch. 17 - Some water is placed in a coffee-cup calorimeter....Ch. 17 - A green plant synthesizes glucose by...Ch. 17 - When most biological enzymes are heated, they lose...Ch. 17 - Acrylonitrile is the starting material used in...Ch. 17 - Calculate the entropy change for the vaporization...Ch. 17 - As O2(l) is cooled at 1 atm, it freezes at 54.5 K...Ch. 17 - Consider the following reaction:...Ch. 17 - Using the following data, calculate the value of...Ch. 17 - Many biochemical reactions that occur in cells...Ch. 17 - Carbon monoxide is toxic because it bonds much...Ch. 17 - In the text, the equation G=G+RTIn(Q) was derived...Ch. 17 - Prob. 101AECh. 17 - Use the equation in Exercise 79 to determine H and...Ch. 17 - Prob. 103AECh. 17 - Consider the following diagram of free energy (G)...Ch. 17 - Prob. 105CWPCh. 17 - For rubidium Hvapo=69.0KJ/mol at 686C, its boiling...Ch. 17 - Given the thermodynamic data below, calculate S...Ch. 17 - Consider the reaction: H2S(g)+SO2(g)3S(g)+2H2O(l)...Ch. 17 - The following reaction occurs in pure water:...Ch. 17 - Prob. 110CWPCh. 17 - Consider the reaction: PCl3(g)+Cl2(g)PCl5(g) At...Ch. 17 - The equilibrium constant for a certain reaction...Ch. 17 - Consider two perfectly insulated vessels. Vessel 1...Ch. 17 - Liquid water at 25C is introduced into an...Ch. 17 - Using data from Appendix 4, calculate H, G, and K...Ch. 17 - Entropy can be calculated by a relationship...Ch. 17 - a. Using the free energy profile for a simple...Ch. 17 - Consider the reaction H2(g)+Br2(g)2HBr(g) where H...Ch. 17 - Consider the system A(g)B(g) at25C. a. Assuming...Ch. 17 - The equilibrium constant for a certain reaction...Ch. 17 - If wet silver carbonate is dried in a stream of...Ch. 17 - Carbon tetrachloride (CCl4) and benzene (C6H6)...Ch. 17 - Sodium chloride is added to water (at 25C) until...Ch. 17 - You have a 1.00-L sample of hot water (90.0C)...Ch. 17 - Consider a weak acid, HX. If a 0.10-M solution of...Ch. 17 - The vaporization of ethanol C2H5OH(l) C2H5OH(g)...Ch. 17 - Some nonelectrolyte solute (molar mass = 142...Ch. 17 - For the equilibrium A(g)+2B(g)C(g) the initial...Ch. 17 - What is the pH of a 0. 125-M solution of the weak...Ch. 17 - Impure nickel, refined by smelting sulfide ores in...
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- 9.34 A copper nail and an iron nail of the same mass and initially at the same room temperature are both put into a vessel containing boiling water. Which one would you expect to reach 100°C first? Why?arrow_forwardDefine the following terms: potential energy, kinetic energy, path-dependent function, state function, system, surroundings.arrow_forwardThe diagram below shows a system that is made up of 3 molecules (labeled A, B, and C) that contains a total of 4 units of energy. Assuming that no molecule can have 0 energy associated with it, and that only integral amounts of units of energy are allowed (energy = 1 or energy = 2 is allowed, but energy = 1.5 is not). In the left-most diagram, one possible way of distributing the four units of energy among these three molecules is presented. This distribution is represented as: (1, 1, 2). %3D 6 SEE 6 5 4 4 4 3 3 3 2 2 1 1 1 A B C AB C АВС (1, 1, 2) a. Show explicitly that a total of 4 units of energy are present in the left-most diagram. b. Explain why (1, 3, 0) is not an allowed distribution for this system. Show the other two allowed distributions of energy for this system using the two blank diagrams, and write the corresponding representation below each diagram. С.arrow_forward
- Consider the following data. 2 H₂0 (1) 2 H₂(g) + O₂(g) 2 HNO3(1) = N₂05(9) + H₂O(1) 2 HNO30 (1) ⇒ N₂(g) + 3 O₂(g) + H₂(g) Use Hess's law to calculate AH for the reaction below. ΔΗ= |1083.8 AH = +571.7 kJ AH = +92.0 kJ AH = +348.2 kJ x kJ 2 N₂05(9) 2 N₂(g) + 5 O₂(g)arrow_forwardDulong and Petit’s law states that specific heat capacity x atomic mass = 3R. If the specific heat capacity of an element is 0.93 J/goC, identify the element.arrow_forwardLook up the Born-Haber Cycle and read about it (book or internet). Use the following information and Hess' Law to calculate AH°iatt of NaCl Na(s) → Na(g) Cl2(g) → 2CI(g) Na(g) > Na*(g) + e Cl(g) + e → Cl'(g) Na(s) +Cl2(g) → NaCl(s) AH° = -411 kJ AH° = 109 kJ AH° = 243 kJ AH° = 496 kJ AH° = -349 kJ %3Darrow_forward
- Given the following thermochemical equations, 4B(s) + 30,(g) → 2B,03(s) AHº= -2543.8 kJ H2 (g) + ½ O2(g) → H,0 (g) AHº= -241.8 kJ B2H,(s) + 30,(g) → B,03(s) + 3H,0 (g) AHº= -2032.9 kJ Calculate the AH° for the decomposition of B,H, into its elements.arrow_forwardwhat is meant by term state function?arrow_forwardCalculate how much energy would be needed for 64.8 g titanium at 19.4 oC to reach 582 degrees Celcius.arrow_forward
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