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One mole of air is compressed from pressure P1 and temperature T1 at constant volume till...

One mole of air is compressed from pressure P1 and temperature T1 at
constant volume till its pressure is doubled. Then it is expanded
reversibly and isothermally to the original pressure, and finally restored
to the original temperature by cooling at constant pressure. Sketch the
path followed by the gas, on a P-V diagram and calculate the net work
done by the gas.

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