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(a) Calculate the change in entropy of an ideal gas [for which p = nRT/V] when...

(a) Calculate the change in entropy of an ideal gas [for which p = nRT/V]

when its volume is doubled at fixed temperature and number of molecules.

(b) Repeat the calculation for a van der Waals gas
[ for which p = nRT/(V–nb) – a (n/V)^2 ]

(c) Give a physical explanation for the difference between the two.

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