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Calculate the change in entropy for one mole of ideal gas which expands from an initial...

Calculate the change in entropy for one mole of ideal gas which expands from an initial volume of 2 L and initial temperature of 500 K to a final volume of 6 L under the following conditions. P(initial) refers to the pressure when T(initial)= 500K, V(initial)= 2 L.

a) Irreversible expansion against a constant pressure of Pinitial/2

b) Irreversible expansion against a vacuum...a 'free expansion'.

c) Adiabatic irreversible expansion against a constant pressure of Pfinal

d) Adiabatic reversible expansion

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