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Version 155 – Exam 1 – laude – (51635)1Thisprint-outshouldhave30questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.ConstantsR= 8.314 J·K−1·mol−1DefinitionsQ≡[C]c[D]d[A]a[B]bG≡H-TSKw≡[H+][OH−]pH≡-log [H+]pOH≡-log [OH−]a)6.0 pointsCarbon Dioxide3142AB200250300350400100101102103104Pressure, 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 K1.1
Version 155 – Exam 1 – laude – (51635)22.9correct184.108.40.206.56.0 pointsAccording to the given phase diagram forcarbon dioxide, what are regions 1, 3 and Brespectively?AB200250300350400100101102Temperature, K1.solid, vapor, critical pointcorrect2.solid, vapor, triple point3.liquid, vapor, critical point4.solid, liquid, triple point5.solid, liquid, critical pointExplanation:As temperature goes up, gas forms. As tem-perature decreases, solid forms.As pressureincreases, solid forms. As pressure decreases,gas forms.Point A is the triple point, andPoint B is the critical point.1 = solid, 2 =liquid, 3 = vapor, 4 = supercritical region0046.0 points