Quiz 3-solutions

Quiz 3-solutions - Version 024 Quiz 3 fakhreddine(51615...

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Version 024 – Quiz 3 – fakhreddine – (51615) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 2.0points At 25 C, K c = 1 . 58 × 10 8 for the reaction NH 4 (NH 2 CO 2 )(s) 2 NH 3 (g) + CO 2 (g) . Calculate K at 25 C for this reaction. 1. 5 . 69 × 10 3 2. 3 . 87 × 10 7 3. 2 . 31 × 10 4 correct 4. 9 . 45 × 10 5 5. 1 . 36 × 10 7 Explanation: 002 2.0points If Δ G rxn is positive, then the forward reaction is (spontaneous / nonspontaneous) and K is (less / greater) than one. 1. nonspontaneous; greater 2. nonspontaneous; less correct 3. None of these; Δ G is not directly related to K . 4. spontaneous, less 5. spontaneous, greater Explanation: A positive Δ G rxn (standard reaction free energy) denotes an endothermic reation, which is nonspontaneous. Also, Δ G rxn = - RT ln K , so a positive Δ G rxn would result in a K that is between the values of zero and one.

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