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delta S = nCpln(T2/T1) for constant pressure and delta S = nCvln(T2/T1) for constant volume. For the values of the heat capactities, Cp is (5/2)*R and Cv is (3/2)*R for ideal gas atoms or monatomic gases. Cp=(7/2)*R and Cv=(5/2)*R for diatomic gases such as nitrogen gas (these needed to be known to do some of the homework problems, but I'm not sure if they're going to be on the midterm).
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