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Chap_16_HW_solutions

# Chap_16_HW_solutions - Chapter 16 homework solutions

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1 CHAPTER 16 HOMEWORK KEY 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 32. The enthalpy of vaporization of ethanol is 38.7 kJ/mol at its boiling point (78 o C). Determine S sys , S surr , and S univ when 1.00 mol of ethanol is vaporized at 78 o C and 1.00 atm.

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2 38. Predict the sign of S o and then calculate S o for each of the following reactions. a. H 2 (g) + 1/2 O 2 (g) H 2 O (l) b. 2 CH 3 OH (g) + 3 O 2 (g) 2 CO 2 (g) + 4 H 2 O (g) c. HCl (g) H + (aq) + Cl - (aq)
3 56. Consider the reaction: 2 POCl 3 (g) 2 PCl 3 (g) + O 2 (g) a. Calculate G o for this reaction. The G f o values for POCl 3 (g) and PCl 3 (g) are -502 kJ/mol and -270. kJ/mol, respectively. b. Is this reaction spontaneous under standard conditions at 298 K? c. The value of S o for this reaction is 179 J/K. At what temperatures is this reaction spontaneous at standard conditions? Assume that H o and S o do not depend on temperature.

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Chap_16_HW_solutions - Chapter 16 homework solutions

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