The vapour density of a mixture containing $NO_2$ and $N_2O_4$ is 38.3 at $27^{\large\circ}C$.Calculate the mole of $NO_2$ in 100g mixture

Question

$\begin{array}{1 1}(a)\;2&(b)\;.01\\(c)\;0.437&(d)\;.234\end{array}$