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Exactly 1.27 moles of an ideal gas undergoes an isothermal expansion (T = 259 K) from...

Exactly 1.27 moles of an ideal gas undergoes an isothermal expansion (T = 259 K) from state A to state B and then returns to state A by another process. The volume of the gas in state B is three times its initial volume.

(a) For the process AB, find the work done by the gas and its change in entropy. work = J change in entropy = J/K

(b) Find the gas's change in entropy for the process BA. J/K

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