A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The molecular formula of that compound is :

A compound of oxygen is 69.5%

 The compound of nitrogen is 30.5%

$\begin{array}{r}\frac{0.695}{16}\times 92=\mathrm{O}\to 4\\ \frac{0.305}{14}\times 92=\mathrm{N}\to 2\end{array}$

Thus, the molecular formula of that compound is ${\mathrm{N}}_2{\mathrm{O}}_4$.