Sketch a PV diagram and find the work done by the gas during the following stages. (a) A gas is expanded from a volume of 1.0 L to 3.5 L at a constant pressure of 7.5 atm. (b) The gas is then cooled at constant volume until the pressure falls to 1.0 atm. (c) The gas is then compressed at a constant pressure of 1.0 atm from a volume of 3.5 L to 1.0 L. (Note: Be careful of signs.) (d) The gas is heated until its pressure increases from 1.0 atm to 7.5 atm at a constant volume. (e) Find the net work done during the complete cycle. Sketch a PV diagram of the process outlined in parts (a)-(d). P(atm) 8 a P (atm) 8

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