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Unformatted text preview: 1) A gas described by the heat capacity C P = Σ n c n T n is heated at constant pressure from T 1 to T 2 (try constant volume). Find the change in entropy of the gas. 2) We can find the entropy change when the gas is isothermally expanded (dT=0) 3) For a process with a general path, we can also integrate along the actual path (assume that V(T) is given, P(T) is analogous – try) 4) Even if the process is irreversible, you must calculate Δ S of the system along a reversible path (see problem 4.10 – p. 180, book). Examples 5) Consider a van der Waals gas that is reversibly and isothermally expanded. new possibility 6) Consider an isothermal reaction (298.15 K): We can see that the reaction is an irreversible and spontaneous process. We also can find Δ S at T=400 K. See briefly also the solution of Exam 1....
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 Spring '08
 PRESTONSNEE
 Physical chemistry, Thermodynamics, pH, Entropy, entropy differentials

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