review-final-2011 - 1. Select the false statement from the...

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Page 1 1. Select the false statement from the following: A) The entropy of a system is a measure of its disorder. B) The standard entropy change for a chemical reaction can be calculated from the absolute entropies of reactants and products. C) For a system at equilibrium, H sys = -T S sys . D) For a spontaneous chemical reaction at 298K and 1 atm, G° < 0. E) S < 0 for the reaction H 2 (g) + O 2 (g) HOOH(g). 2. The diagram below shows the variation of the Gibbs free energy with temperature, T, for some process. Identify the false statement: A) S° > 0 for this process. B) H° > 0 for this process. C) H° = T S° at a certain temperature. D) The process is spontaneous at high temperatures. E) If H° remains constant with T, S° must increase with T. 3. When NH 3 (g) reacts spontaneously with HCl(g), solid NH 4 Cl is formed. This is accompanied by the changes A) G > 0, H > 0, S > 0 B) G > 0, H < 0, S < 0 C) G < 0, H > 0, S < 0 D) G < 0, H < 0, S < 0 E) G < 0, H > 0, S > 0
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Page 2 4. Consider the reaction H 2 O 2 (l) H 2 O(l) + 1/2 O 2 (g) for which G° = -119 kJ at 25°C. Select the correct statement(s) below. (i) The pressure of oxygen gas is much less than 1 atm at equilibrium.
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review-final-2011 - 1. Select the false statement from the...

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