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Quiz 6-solutions - Version 081 Quiz 6 laude(50995 This...

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Version 081 – Quiz 6 – laude – (50995) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Constants R = 8 . 314 J · K 1 · mol 1 = k · N A k = 1 . 381 × 10 23 J · K 1 N A = 6 . 626 × 10 23 mol 1 Equations U = 0 . 5 kT S = k ln W Δ S = q T Δ G = Δ H - T Δ S Δ U = q + w = q v = Δ H + P Δ V Δ H = q p q = mc Δ T = - Δ H w = - P Δ V = - Δ n gas RT Δ S universe 0 Δ S universe = Δ S sys + Δ S surr Δ G sys = - T Δ S universe 001 5.0 points When calculating positional entropy at ab- solute zero using the Boltzmann formula ( S = k ln W ), which of the following state- ments is/are true? I) An experimentally determined value of W is less than the ideal value. II) If S = R ln 2 for 1 mol of some com- pound, then a single molecule of the same compound has a positional entropy of S = N A R ln 2, where N A is Avogadro’s number. III) The positional entropy of a group of molecules with one orientation will equal zero. 1. I, III correct 2. I only 3. II only 4. III only 5. I, II 6. I, II, III 7. II, III Explanation: Statement I is true because ideal values as- sume that IMF aren’t present and therefore
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