review-final - 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).
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Page 2 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.
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Page 3 3. The enthalpy of vaporization of HCN is 20.0 kJ/mol. The molar entropy of the gas is 201.7 J/mol·K, and the molar entropy of the liquid is 112.8 J/mol·K. Calculate the normal boiling point of HCN (in °C). A) –48 B) +0.22 C) +4.4 D) +89 E) +225
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Page 4 4. When NH 3 and HCl vapours mix, solid NH 4 Cl is formed. What are the changes accompanying this reaction? 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 5 5. Consider the reaction H
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This note was uploaded on 12/12/2011 for the course CHEMISTRY 1E03 taught by Professor Britz during the Spring '09 term at McMaster University.

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

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