A piston–cylinder assembly contains 0.9 kg of air at a temperature of 300 K and a pressure of 1 bar. The air is
compressed to a state where the temperature is 470K and the pressure is 6 bar. During the compression, there is
a heat transfer from the air to the surroundings equal to 20 kJ. Determine the work during the process in kJ, Plot
the process in PV diagram.

and is the work done on or by the system