please solve it clearly with all steps and converting if needed and explain what you are doing dont just put numbers

Example 2.10 Calculate U and H for air whe ir changed from an initial state of 40(F) and 10(atm), where its molar volume is 36.49(ft)3(lbmole)1, to a final state of 140(F) and 1(atm). Assume for air that PV/T is constant and that Cv=5 and Cp=7(Btu)(lbmole)1(F)1