$\mathrm{X} \mathrm{~g}$ of ethanamine was subjected to reaction with $\mathrm{NaNO}_2 / \mathrm{HCl}$ followed by hydrolysis to liberate $\mathrm{N}_2$ and $\mathrm{HCl}$. The $\mathrm{HCl}$ generated was completely neutralised by 0.2 moles of $\mathrm{NaOH} . \mathrm{X}$ is _________ g.