The oxidation of nitric oxide

$NO+\frac{1}{2}{O}_{2}N{O}_2$

takes place in an isothermal batch reactor. The reactor is charged with a mixture containing $20\mathrm{.}0$

volume percent NO and the balance air at an initial pressure of $380$kPa $($absolute$).$

Assuming ideal gas behavior, determine the composition of the mixture $($component mole frac$-$

tions$)$ and the final pressure $(kPa)$ if the conversion of $NO$ is $90\%.$

$($Assume also $T=$ constant$)$