In a heat engine, 3.00 mol of a monatomic ideal gas, initially at 4.00 atm of pressure, undergoes an isothermal expansion, increasing its volume by a factor of 9.50 at a constant temperature of 650.0 K. The gas is then compressed at a constant pressure to its original volume. Finally, the pressure is increased at constant volume back to the original pressure.
(a) Draw a PV diagram of this three-step heat engine.
(b) For each step of this process, calculate the work done on the gas, the change in internal energy, and the heat transferred into the gas.
(c) What is the efficiency of this engine?