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Unformatted text preview: CHM2046 – Prof. C.R. Martin Quiz 2 Mar. 28, 2008 NAME: _________KEY_______________ Section #:_______________ USE: R = 8.3145 J/(mol∙K) 1. Which of the following applies to the second law of thermodynamics? (6 pts) a. Energy cannot be created or destroyed, it can only be converted from one form to another. b. The entropy of a perfect crystal is zero at a temperature of absolute zero. c. ΔS system = ΔS universe + ΔS surroundings d. In a spontaneous process, the change in the enthalpy of the universe is negative, i.e. ΔH universe < 0. e. In a spontaneous process, the change in the entropy of the universe is positive, i.e. Δ S universe > 0. 2. Calculate ΔS o for the following reaction? (15 pts) 2KClO 3(s) ↔ 2KCl (s) + 3O 2(g) S o KClO3(s) : 143.1 J/mol . K S o KCl(s) : 82.59 J/mol . K S o O2(g) : 205.0 J/mol . K Δ S o rxn = 3 mol × S o O2(g) + 2 mol × S o KCl(s) – 2 mol × S o KClO3(s) = = 3 mol × 205.0 J/mol ....
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- Spring '07
- Thermodynamics, pts, spontaneous process, Gorxn, following disproportionation reaction