PracticeExam2

PracticeExam2 - R = 8.314 J(K mol 1bar = 105 Pa 1 L =10-3...

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R = 8.314 J/(K mol), 1bar = 10 5 Pa, 1 L =10 -3 m 3 1 . True/False (10 points each). Classify the statements below as either True or False (No explanation required). (a) At T = 0 K, the entropy of a substance becomes zero. (b) A very stiff, rigid solid like diamond has larger molar entropy than a softer solid like silver under the same pressure and temperature. (c) The chemical potential of an ideal gas increases if the pressure increases at a constant temperature. (d) If you know the Gibbs free energy G of a substance as a function of V (volume) and T (temperature), you can calculate other state functions such as U , H and A . (e) The heat of formation, f H Δ of an element (a chemical made of a single atomic species such as H 2 ) in the reference state is always zero. 2. Calculate the entropy change (of system) when one mole of liquid water at 323 K is evaporated to form water vapor at 423 K. The pressure is constant at 1 atm. The heat capacities ( C P ) of liquid and vapor water are 75.3 J/K/mol and 33.6 J/K/mol, respectively. Assume that the

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PracticeExam2 - R = 8.314 J(K mol 1bar = 105 Pa 1 L =10-3...

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