2.10 Calculate the internal-energy and enthalpy changes for air when changed from an initial state of 40(°F) and 10(atm), where its molar volume is 36.49(ft)'(lb mole)', to a final state of

140(°F) and 1(atm). Assume for air that PV/T is constant and that C₁= 5 and Cp 7(Btu) (lb mole) •¹ (°F)-¹