For each case determine the change in entropy for the surroundings and the universe, when 1 mole of a diatomic gas expands from its initial volume of 5 L and 31.5 ◦C to:
CASE (a) a final volume of 25 L reversibly and isothermically.
CASE (b) irreversibly and isothermically against an external pressure of 1 atm.
CASE (c) a final volume of 25 L reversibly and adiabatically. Yes, it is zero, but you have to demonstrate it.
CASE (d) irreversibly and adiabatically against an external pressure of 1 atm.
PLEASE, complete answers from CASE A to D.
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