Chapter_16_Homework_Key

# Chapter_16_Homework_Key - Chapter 16 Homework Solutions 19...

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Chapter 16 Homework Solutions 19. Which of the following processes are spontaneous? a. Salt dissolves in H 2 O. b. A clear solution becomes a uniform color after a few drops of dye are added. c. Iron rusts. d. You clean your bedroom. 23. Choose the compound with the greatest positional probability in each case. a. 1 mol H 2 (at STP) or 1 mol H 2 (at 100 o C, 0.5 atm) b. 1 mol N 2 (at STP) or 1 mol N 2 (at 100 K, 2.0 atm) c. 1 mol H 2 O (s) (at 0 o C) or 1 mol H 2 O (l) (at 20 o C) 24. Which of the following involve an increase in the entropy of the system? a. melting of a solid b. sublimation c. freezing d. mixing e. separation f. boiling 25. Predict the sign of S surr for the following processes. a. H 2 O (l) H 2 O (g) b. CO 2 (g) CO 2 (s)

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27. Given the H and S, which of the following changes will be spontaneous at constant T and P? a. H = +25 kJ, S = +5.0 J/K, T = 300. K b. H = +25 kJ, S = +100. J/K, T = 300. K c. H = -10. kJ, S = +5.0 J/K, T = 298 K d. H = -10. kJ, S = -40. J/K, T = 200. K 29. Ethanethiol (C 2 H 5 SH; also called methylmercaptan) is commonly added to natural gas to provide the "rotten egg" smell of a gas leak. The boiling point of ethanethiol is 35 o C and its heat of vaporization is 27.5 kJ/mol. What is the entropy of vaporization for this substance? 37. Predict the sign of S o and then calculate the sign of S o for each of the following reactions. a. 2 H 2 S (g) + SO 2 (g) 3 S rhombic (s) + 2 H 2 O (g) b. 2 SO 3 (g) 2 SO 2 (g) + O 2 (g) c. Fe 2 O 3 (s) + 3 H 2 (g) 2 Fe (s) + 3 H 2 O (l)
39. For the reaction: C 2 H 2 (g) + 4 F 2 (g) 2 CF 4 (g) + H 2 (g) , S o is equal to -358 J/K. Use this value and data from Appendix 4 to calculate the value of S o for CF 4 (g) . 42. When most biologic enzymes are heated they lose their catalytic activity. The change that occurs on heating is endothermic and spontaneous. Is the structure of the original enzyme or its new form more ordered? Explain. 45.

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Chapter_16_Homework_Key - Chapter 16 Homework Solutions 19...

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