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Unformatted text preview: 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 10.0 points 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, H is negative. 4. For reactions in which the reacting system becomes more disordered, S is positive. 5. If the free energy change of reaction is negative the reaction will occur under the given conditions. 002 10.0 points 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 10.0 points For a given reaction G is very negative. Which of the following is FALSE? 1. 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 S is positive, then the reaction will probably be more spontaneous at higher tem- peratures. 4. The reaction should occur very rapidly because G is very negative. 5. The reaction is termed spontaneous. 004 10.0 points The G 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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This note was uploaded on 01/30/2012 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas at Austin.
- Spring '08