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

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A sample of gas, initially with a volume of 1.0 L, undergoes athermodynamic cycle. Find the work done by thegas on its environment during each stage of the cycle describedbelow. (Enter your answers in J.)
(a)
First, the gas expands from a volume of 1.0 L to 3.5 Lat a constant pressure of 7.0 atm.
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(b)
Second, the gas is cooled at constant volume until the pressurefalls to 1.0 atm.
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(c)
Third, the gas is compressed at a constant pressureof 1.0 atm from a volume of 3.5 L to 1.0 L.(Note: Be careful of signs.)
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(d)
Finally, the gas is heated until its pressure increasesfrom 1.0 atm to 7.0 atm at a constantvolume.
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(e)
What is the net work done by the gas on itsenvironment during the complete cycle described above?
in Joules