HW11-problems - arriaga(yga77 HW11 quy(50970 This print-out...

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arriaga (yga77) – HW11 – quy – (50970) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Which statement below is FALSE? 1. Endothermic reactions may be sponta- neous. 2. The entropy of a system increases when order increases. 3. For reactions that release heat to the surroundings, Δ H is negative. 4. For reactions in which the reacting system becomes more disordered, Δ S is positive. 5. If the free energy change of reaction is negative the reaction will occur under the given conditions. 002 10.0points Which one of the following reactions has a positive entropy change? 1. H 2 O(g) H 2 O( ) 2. 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) 3. BF 3 (g) + NH 3 (g) F 3 BNH 3 (s) 4. N 2 (g) + 3 H 2 (g) 2 NH 3 (g) 5. 2 NH 4 NO 3 (s) 2 N 2 (g) + 4 H 2 O(g) + O 2 (g) 003 10.0points For a given reaction Δ G is very negative. Which of the following is FALSE? 1. Δ S for the reaction may be positive or negative. 2. The entropy of the universe must increase as a result of this reaction occuring. 3. If Δ S is positive, then the reaction will probably be more spontaneous at higher tem- peratures. 4. The reaction should occur very rapidly because Δ G is very negative. 5. The reaction is termed spontaneous. 004 10.0points The Δ G 0 f for Cu 2 S(s) and SO 2 (g) are - 86 . 2 kJ / mol and - 300 . 1 kJ / mol, respec- tively.
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