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Question: calculate the entropy change for 1 mol of a diatomic...

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Calculate the entropy change for 1 mol of a diatomic gas when it expands from its initial volume of 5 L and 31.5°C to:

(a) a final volume of 25L reversibly and isothermically.
(b) irreversibly and isothermically against an external pressure of 1 atm.
(c) a final volume of 25 L reversibly and adiabatically.
Yes, it is zero, but you have to demonstrate it.
(d) irreversibly and adiabatically against an external pressure of 1 atm.
(e) For all cases above, calculate also the change in entropy for the surroundings and the
universe.

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