1. Air at 20 °C and 1.05 bar occupies a volume of 0.025 m³ (point 1). The air is heated at constant volume until the pressure is 4.5 bar (point 2), and then it is cooled at constant pressure back to the original temperature (point 3). (a) Draw this process on the P-V plane, labelling the points. (b) Calculate the net work done, Wnet. Is work being done on the gas or is the gas doing work on something external? (c) Calculate the net heat transferred, Qnet. Is heat leaving the gas or is heat being added to the gas?