1. One mol of air is compressed from an ideal state of 1 bar and 25°C to a final state of 5 bar and 25 °C by three different mechanically reversible processes in a closed system:
Assume air to be an ideal gas with the constant heat capacity，Cv= (5/2)R and Cp = (7/2)R，in which R is gas constant and R = 8.314 J/mol.K. Calculate the work required, heat transferred, and the changes in internal energy and enthalpy of the air for each process. (30 points)
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