5. Air at 1 bar 298.15K is compressed to 5 bar and 298.15K by two different mechanically reversible process: (20 points) (a) Cooling at constant pressure followed by heating at constant volume. (b) Heating at constant volume followed by cooling at constant volume. Calculate the heat and work requirement and U and H of the air for each path. The following heat capacities for air may be assumed independent of temperature. Cv=20.78 and Cp=29.10Jmol1K1. Assume also for air that PVI os a constant, regardless of the change it undergoes. At 298.15K and 1 bar the molar volume of air is 0.025m3mol1