Sketch a PVdiagram and find the work done by the gas during the following successive stages: (a) A gas is expanded from a volume of 1 L to 3 L at a constant pressure of 3 atm. (b) The gas is then cooled atconstant volume until the pressure falls to 2 atm. (c) The gas is then compressed at a constant pressure of 2 atm from a volume of 3 L to 1 L. (d) The gas is heated until its pressure increases from 2 atm to 3 atm at a constant volume. (e) Find the net work done during the complete cycle.