\textbf{225 –} Given the following mechanism, which is the correct overall reaction equation?
\begin{enumerate}
\item $2\text{NO}(\text{g}) \rightarrow \text{N}_2\text{O}_2(\text{g})$
\item $2\text{H}_2(\text{g}) \rightarrow 4\text{H}(\text{g})$
\item $\text{N}_2\text{O}_2(\text{g}) + \text{H}(\text{g}) \rightarrow \text{N}_2\text{O}(\text{g}) + \text{HO}(\text{g})$
\item $2\text{HO}(\text{g}) + 2\text{H}(\text{g}) \rightarrow 2\text{H}_2\text{O}(\text{g})$
\item $\text{H}(\text{g}) + \text{N}_2\text{O}(\text{g}) \rightarrow \text{HO}(\text{g}) + \text{N}_2$
\end{enumerate}
\begin{tabular}{ll}
(1) $2\text{OH}(\text{g}) + 2\text{H}(\text{g}) \xrightarrow{\text{N}_2\text{O}_2(\text{g})} 2\text{H}_2\text{O}(\text{g})$ & (2) $\text{N}_2\text{O}_2(\text{g}) + 2\text{H}(\text{g}) \rightarrow \text{N}_2\text{O}(\text{g}) + \text{H}_2\text{O}(\text{g})$ \\
(3) $2\text{NO}(\text{g}) + \text{H}_2(\text{g}) \rightarrow \text{N}_2\text{O}(\text{g}) + \text{H}_2\text{O}(\text{g})$ & (4) $2\text{NO}(\text{g}) + 2\text{H}_2(\text{g}) \rightarrow \text{N}_2(\text{g}) + 2\text{H}_2\text{O}(\text{g})$
\end{tabular}