You are conducting experiments to study prototype heat engines. In one test, 4.00 mol of argon gas are taken around the cycle shown in. The pressure is low enough for the gas to be treated as ideal. You measure the gas temperature in states a, b, c, and d and find Ta = 250.0˚K, Tb = 300.0˚K, Tc = 380.0˚K, andTd = 316.7˚K. A to B -- constant volume B to C -- constant pressure C to D -- constant volume  D to A -- constant pressure    Calculate the efficiency e of the cycle.  e = ______ %

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