General Chemistry 2 - 100483

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Question 1 Choose the member with the higher entropy in each of the following pairs, and justify your choice [assume constant temperature, except in part (e)] (a)1 mol of SO_2 (g) or 1 mol of SO_3 (g) (b) 1 mol of CO_2 (s) or 1 mol of CO (g) (c) 3 mol of O_2 (g) or 2 mol of O_3 (g) (d) 1 mol of KBr(s) or 1 mol of KBr(aq) (e) seawater at 2 ?C or at 23 ?C Question 2 Predict the sign of ?S_rxn^? and calculate its value for the combustion of 1 mol of propane at 25^0 C. C_3 H_8 (g) + 5O_2 (g) ? 3CO_2 (g) + 4H_2 O(l) Compound C_3 H_8 (g) O_2 (g) CO_2 (g) H_2 O(l) S^? (J/K·mol) 269.9 205.0 213.7 69.9 Question 3 At 298 K, the formation of ammonia has a negative ?S_sys^0; s N_2 (g) + 3H_2 (g) ? 2NH_3 (g) ?S_sys(rxn)^0 = –197 J/K Calculate ?S_univ^0, and state whether the reaction occurs spontaneously at this temperature.
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Question 3 Answer

At 298 K, the formation of ammonia has a negative