Problem #$2$: $(9)$

Air enters an insulated turbine operating at steady state at $\frac{4\mathrm{.}89}{b}ar,597C$ and exits at $\frac{1}{b}ar,$

$297C.$ Neglecting kinetic and potential energy changes and assuming the ideal gas model,

determine the work developed, in $kJ$ per $kg$ of air flowing through the turbine.