A piston-cylinder system has initial volume 1.0 liters, and contains ideal gas at 300k and 1 atm, with Cv=2.5R. The piston is held fixed and the cylinder placed in contact with a heat reservoir at 600k. Once equilibrium is reached, the has is allowed to expand isothermally. When pressure reaches 1atm the gas is cooled at constant pressure to 300k. This cyclic process is repeated once a second. What is the rate at which the gas does work?