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Chapter 17 TAVSS

# Chapter 17 TAVSS - CHAPTER 17 THERMODYNAMICS Problems to...

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CHAPTER 17 THERMODYNAMICS Problems to prepare students for Chem 162 hourly exam III. “THERMODYNAMICS” covers Zumdahl chapter 16. ENTROPY CONCEPTS ENTROPY CALCULATIONS FREE ENERGY CONCEPTS FREE ENERGY CALCULATIONS FREE ENERGY AND EQUILIBRIA CONCEPTS FREE ENERGY AND EQUILIBRIA CALCULATIONS E. Tavss 9/5/04 Chapter 16 practice problems 1

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ENTROPY CONCEPTS 41 CHEM 162-2006 FINAL EXAM + ANSWERS CHAPTER 16 - THERMODYNAMICS ENTROPY CONCEPTS Which of the following processes would you predict would have the greatest increase in entropy? A. Ca(OH) 2 (s) + 2HCl(g) → CaCl 2 (s) + 2H 2 O(g) B . CO 2 (s) → CO 2 (g) C. H 2 (g) + Cl 2 (g) → 2HCl(g) D. N 2 (g) + 3H 2 (g) → 2NH 3 (g) E. H 2 O( l ) → H 2 O(s) An increase in number of moles of gas corresponds to an increase in entropy. A. No change in number of moles of gas. B. Increase of one mole of gas. C. No change in number of moles of gas. D. Decrease of two moles of gas. E. No change in number of moles of gas. 2. CHEM 162-2000 HOURLY EXAM III THERMODYNAMICS ENTROPY CONCEPTS All of the following processes would be expected to have a positive S o except A. PCl 5 (s) PCl 3 ( ) + Cl 2 (g) B. H 2 (g, 1 L) H 2 (g, 2 L) at constant T C . 2HI(g) H 2 (g) + I 2 (s) D. (NH 4 ) 2 SO 4 (s) 2NH 4 + (aq) + SO 4 2- (aq) E. C 2 H 5 OH( , 35 o C) C 2 H 5 OH( , 40 o C) 1. CHEM 162-2001 HOURLY EXAM III THERMOCHEMISTRY ENTROPY CONCEPTS All of the following processes would be expected to have a positive S ° except A. C 6 H 12 O 6 (s) 2 C 2 H 5 OH( l ) + 2 CO 2 (g) Going from a solid to a liquid or a gas provides an increase in disorder and a corresponding increase in entropy. B . 2 NH 3 (g) + CO 2 (g) NH 2 CONH 2 (aq) + H 2 O( l ) Chapter 16 practice problems 2
Going from gas to liquids is a decrease in entropy. C. CaCO 3 (s) CaO(s) + CO 2 (g) Going from a solid to a gas is an increase in entropy. D. (NH 4 ) 2 SO 4 (s) 2 NH 4 + (aq) + SO 4 2- (aq) Going from a solid to a liquid is an increase in entropy. E. N 2 H 4 ( l ) N 2 (g) + 2 H 2 (g) Going from a liquid to a gas is an increase in entropy. 9. CHEM 162-2001 HOURLY EXAM III THERMODYNAMICS ENTROPY CONCEPTS The Second Law of Thermodynamics requires that a spontaneous process must have A. S sys > 0 B. S surr > 0 C. S sys < 0 D. S univ = 0 E . S univ > 0 41. CHEM-2002 FINAL EXAM + ANSWERS THERMODYNAMICS ENTROPY CONCEPTS At which temperature and pressure does 1 mol of He gas have the highest entropy? High temperature results in the greatest He motion, and therefore high entropy. Low pressure results in the most space for He to move around in, and therefore high entropy. The combination of high temperature and low pressure provides the highest entropy.

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Chapter 17 TAVSS - CHAPTER 17 THERMODYNAMICS Problems to...

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