A system consisting of n mol of an ideal gas undergoes
A system consisting of n mol of an ideal gas undergoes two reversible processes. It starts with pressure Pi and volume Vi, expands isothermally, and then contracts adiabatically to reach a final state with pressure Pi and volume 3Vi.
(a) Find its change in entropy in the isothermal process. The entropy does not change in the adiabatic process.
(b) What If? Explain why the answer to part (a) must be the same as the answer to Problem 66.
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