vb1-4) A monoatomic ideal gas at 27°C has a volume of 0.50 m3 and a pressure of 2.0 bar.
 The gas expands adiabatically to a volume of 1.2 m3. 
The isotherm is then compressed until the volume is equal to the original volume.
 Finally, the pressure isochore increases until the gas has returned to its initial state.
Determine all state parameters. 
Calculate the return.