One mole of air, initially at 150 degree C and 8 bar pressure undergoes the following mechanically reversible changes. It expands isothermally to a pressure P₂ and is then cooled at a constant volume to 50⁰C and a final pressure of 3 bar. Assume that the air behaves as an ideal gas, that the specific heat capacity at constant volume, Cᵥ = 5/2 R and that the specific heat capacity at constant pressure, Cₚ = 7/2 R, where the gas constant, R = 8.314 J mol⁻¹ K⁻¹. Draw a fully labelled Pressure-Volume diagram for the process.