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Three moles of isobutane at 40 bar and 450K are confined in a piston-cylinder. Calculate the work delivered by the system if a) Isobutane expands

Three moles of isobutane at 40 bar and 450K are confined in a piston-cylinder. Calculate the work delivered by the system if
a) Isobutane expands reversibly and isothermally at 10 bar.
b) Isobutane expands reversibly and adiabatically at 10 bar.

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