The following mechanically reversible processes transform an ideal gas, Cp = (7/2)R and Cv = (5/2)R, from P1 = 1 bar and V1 = 12 m3 to P2 = 12 bar and V2 = 1 m3:

(a) isothermal compression; (b) adiabatic compression followed by cooling at constant pressure; (c) heating at constant volume followed by cooling at constant pressure.

Calculate Q, W, U and H for each of these processes and sketch the paths of all processes on a single PV diagram.