P-T curve of a cyclic process is shown. If number of moles of the gas are n, the work done by the gas in the given process is

Since paths AB and CD are isochoric, therefore work done during AB and CD is zero. Paths BC and DA are isobaric.Hence WBC = nR∆T = nR(T3-T2)            WDA = nR(T1-T4)Total work done = WBC+WDA = nR(T1+T3-T4-T2)