\textbf{212 --} The sum of the stoichiometric coefficients of the reactants in the balanced equation:
$$\text{C}_2\text{H}_5\text{NH}_2 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{N}_2$$
after balancing, which option is correct?
\hspace{2cm} (1) 22 \hspace{2cm} (2) 24 \hspace{2cm} (3) 15 \hspace{2cm} (4) 17