(a) Find the heat flow into or out of the gas during each step, 

(b) Find the entropy change of the gas during the isothermal step.
(c) What is the entropy change of the gas for a complete cycle? Is it equal in magnitude to the entropy change of the environment per cycle? Explain.

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.