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If one mole of an ideal gas at (P1, V1) ...

If one mole of an ideal gas at `(P_1, V_1)` is allowed to expand reversibly and isothermally (A to B) its pressure is reduced to one-half of the original pressure (see figure). This is followed by a constant volume cooling till its pressure is reduced to one-fourth of the initial value `(BrarrC)` . Then it is restored to its initial state by a reversible adiabatic compression (C to A). The net workdone by the gas is equal to :

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