90 -- In a two-liter closed container, $0.2$ mol of ammonia gas and $0.25$ mol of oxygen gas react. If the reaction rate is constant and equal to $0.02\ \text{mol·L}^{-1}\text{·min}^{-1}$, after $30$ seconds, how many moles of gas are in the container and how many seconds until the reaction is complete? $$\text{NH}_3(g) + \text{O}_2(g) \longrightarrow \text{NO}(g) + \text{H}_2\text{O}(g)$$ (Balance the reaction equation.) (1) $30,\ 0.47$ (2) $45,\ 0.47$ (3) $30,\ 0.38$ (4) $45,\ 0.38$
\textbf{90 --} In a two-liter closed container, $0.2$ mol of ammonia gas and $0.25$ mol of oxygen gas react. If the reaction rate is constant and equal to $0.02\ \text{mol·L}^{-1}\text{·min}^{-1}$, after $30$ seconds, how many moles of gas are in the container and how many seconds until the reaction is complete?
$$\text{NH}_3(g) + \text{O}_2(g) \longrightarrow \text{NO}(g) + \text{H}_2\text{O}(g)$$
(Balance the reaction equation.)
\begin{center}
(1) $30,\ 0.47$ \qquad (2) $45,\ 0.47$ \qquad (3) $30,\ 0.38$ \qquad (4) $45,\ 0.38$
\end{center}