\( X \) \( \mathrm{g} \) of ethylamine is subjected to reaction with \( \mathrm{NaNO}_2 / \mathrm{HCl} \) followed by water; evolved dinitrogen gas which occupied \( 2.24 \, \mathrm{L} \) volume at STP. \( X \) is \( \_\_\_\_\_\_ \times 10^{-1} \, \mathrm{g} \).
