Problem #$3(30$ pt$)$

Calculate $U,H,Q$ and $W$ for $1kg$ of air that undergoes the following mechanically reversible process: Isobaric heating from $300K$ and $1$ bar until the three times the initial volume. Make the assumption that PV$/$T$=83\mathrm{.}14($bar mole K$)$ and the Cp for air is $29$ Joule$/($mole K$)$ and the molecular weight of air is $28\mathrm{.}9g\frac{r}{m}$ole.