Exam 1-solutions - Version 155 Exam 1 laude(51635 This print-out should have 30 questions Multiple-choice questions may continue on the next column or

# Exam 1-solutions - Version 155 Exam 1 laude(51635 This...

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Version 155 – Exam 1 – laude – (51635) 1 This print-out should have 30 questions. Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.ConstantsR= 8.314 J·K1·mol1DefinitionsQ[C]c[D]d[A]a[B]bGH-TSKw[H+][OH]pH≡-log [H+]pOH≡-log [OH] a) 6.0 points Carbon Dioxide 3142AB200250300350400100101102103104Pressure, barTemperature, KA sample of carbon dioxide is stored at104bar and 250 K.This sample is thendecompressed to 100bar at constant temper-ature. Then, at constant pressure it is heatedto 400 K.Next, it is compressed at con-stant temperature to 200 bar.According tothe phase diagram, how many phase transi-tions has the carbon dioxide gone through,and what is its final state? What would be the pH of a 0.25 M solutionof phenylamine (C6H5NH2) at room temper-ature? The K 1. 1
Version 155 – Exam 1 – laude – (51635) 2 2. 9 correct 3. 10.5 4. 13 5.5 6.0 points According to the given phase diagram forcarbon dioxide, what are regions 1, 3 and Brespectively? AB200250300350400100101102Temperature, K1.solid, vapor, critical pointcorrect 2.solid, vapor, triple point3.liquid, vapor, critical point4.solid, liquid, triple point5.solid, liquid, critical point Explanation: As temperature goes up, gas forms. As tem- perature decreases, solid forms. As pressure increases, solid forms. As pressure decreases, gas forms. Point A is the triple point, and Point B is the critical point. 1 = solid, 2 = liquid, 3 = vapor, 4 = supercritical region 004 6.0 points