216. Regarding the reaction: $\text{N}_2\text{H}_4(\text{g}) + \text{H}_2(\text{g}) \rightarrow 2\text{NH}_3(\text{g}) + 183\,\text{kJ}$, which statement is correct?
[(1)] The energy level of the products is lower than that of the reactants.
[(2)] With the production of each mole of ammonia, $183\,\text{kJ}$ of energy is produced.
[(3)] The reaction is exothermic and when carried out in a flask, the temperature of it decreases.
[(4)] When the reaction is carried out at constant temperature, energy must be transferred from the surroundings to the system.
\textbf{216.} Regarding the reaction: $\text{N}_2\text{H}_4(\text{g}) + \text{H}_2(\text{g}) \rightarrow 2\text{NH}_3(\text{g}) + 183\,\text{kJ}$, which statement is correct?
\begin{itemize}
\item[(1)] The energy level of the products is lower than that of the reactants.
\item[(2)] With the production of each mole of ammonia, $183\,\text{kJ}$ of energy is produced.
\item[(3)] The reaction is exothermic and when carried out in a flask, the temperature of it decreases.
\item[(4)] When the reaction is carried out at constant temperature, energy must be transferred from the surroundings to the system.
\end{itemize}