A sample of gas, initially with a volume of 1.0 L, undergoes a thermodynamic cycle. Find the work done by the gas on its environment during each stage of the cycle described below. (Enter your answers in J.)   (a) First, the gas expands from a volume of 1.0 L to 4.5 L at a constant pressure of 7.0 atm.  J (b) Second, the gas is cooled at constant volume until the pressure falls to 1.0 atm.  J (c) Third, the gas is compressed at a constant pressure of 1.0 atm from a volume of 4.5 L to 1.0 L. (Note: Be careful of signs.)  J (d) Finally, the gas is heated until its pressure increases from 1.0 atm to 7.0 atm at a constant volume.  J (e) What is the net work done by the gas on its environment during the complete cycle described above?  J

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