thermoreviewch20 - Name Date 1 Which of the following...

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Name: __________________________ Date: _____________ 1. Which of the following species has the highest entropy (S ° ) at 25 ° C? A) CH 3 OH(l) B) CO(g) C) MgCO 3 (s) D) H 2 O(l) E) Ni(s) 2. Arrange the following compounds in order of increasing standard molar entropy at 25 ° C: C 3 H 8 (g), C 2 H 4 (g), ZnS(s), and H 2 O(l). A) ZnS(s) < H 2 O(l) < C 3 H 8 (g) < C 2 H 4 (g) B) C 2 H 4 (g) < H 2 O(l) < C 3 H 8 (g) < NaCl(s) C) ZnS(s) < C 3 H 8 (g) < C 2 H 4 (g) < H 2 O(l) D) C 3 H 8 (g) < C 2 H 4 (g) < H 2 O(l) < ZnS(s) E) ZnS(s) < H 2 O(l) < C 2 H 4 (g) < C 3 H 8 (g) 3. Which response includes all the following processes that are accompanied by an increase in entropy? 1. 2SO 2 (g) + O 2 (g) SO 3 (g) 2. H 2 O(l) H 2 O(s) 3. Br 2 (l) Br 2 (g) 4. H 2 O 2 (l) H 2 O(l) + (1/2)O 2 (g) Page 1
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4. Without reference to a table, arrange the following reactions according to increasing S. 1. CH 4 (g) + H 2 O(g) CO(g) + 3H 2 (g) 2. C(s) + O 2 (g) CO 2 (g) 3. H 2 O 2 (l) H 2 O(l) + (1/2)O 2 (g) 5. Determine S ° for the reaction SO 3 (g) + H 2 O(l) H 2 SO 4 (l). S ° (J/K·mol) SO 3 256.2 H 2 O 69.9 H 2 SO 4 156.9 Page 2
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6. Calculate S ° at 25 ° C for the reduction of PbO(s), 2PbO(s) + C(s) 2Pb(s) + CO 2 (g) given the following absolute entropies: S ° (J/K·mol) PbO(s) 69.45 C(s) 5.7 Pb(s) 64.89 CO 2 (g) 213.6 A) +198.8 J/K·mol B) +488.0 J/K·mol C) +353.6 J/K·mol D) - 203.3 J/K·mol E) +203.3 J/K·mol Page 3
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7. The entropy change on vaporization ( S vap ) of a compound or element is: A) always negative.
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