Elemental analysis of an organic compound gives the following elemental mass percentages: $H,4\mathrm{.}545\%$;$C,48\mathrm{.}64\%$;$N,25\mathrm{.}22\%$ and $0,21\mathrm{.}60\%.$ Vapourization of $470mg$ of the compound in a $75-mL$ bulb at $262C$ gives a pressure of $\frac{0\mathrm{.}619}{b}ar.$ What is the molecular formula of the compound?

$H$

N

$0$