Calculate the internal$-$energy and enthalpy changes that occur when air is changed from an initial state of $4($C$)$ and $10($atm$),$ where its molar volume is $0\mathrm{.}002278$m $($g mole $)-1,$ to a final state of $60($C$)$ and $1($atm$).$ Assume for air that PV$/$T is constant and that C$=20\mathrm{.}93$ and Cp $=29\mathrm{.}31$J$($g mole$)-1($C$)1$