224 – Referring to the figure below, for the hypothetical reaction $\text{A} \rightarrow \text{B}$ in a 4-liter container, the average reaction rate from time $t_2$ to $t_4$ is how many $\text{mol·L}^{-1}\text{·min}^{-1}$, and how many times is it equal to the average rate from time $t_2$ to $t_4$? (Assume each ball represents $0.05$ mol of each substance.) [Figure: Four containers at $t_1=0$ min, $t_2=20$ min, $t_3=40$ min, $t_4=60$ min showing black dots (A) and white dots (B)]
(1) $1/5\ ,\ 7/5\times10^{-3}$
(2) $1/5\ ,\ 1/875\times10^{-3}$
(3) $3\ ,\ 1/875\times10^{-3}$
(4) $3\ ,\ 7/5\times10^{-3}$
\textbf{224 –} Referring to the figure below, for the hypothetical reaction $\text{A} \rightarrow \text{B}$ in a 4-liter container, the average reaction rate from time $t_2$ to $t_4$ is how many $\text{mol·L}^{-1}\text{·min}^{-1}$, and how many times is it equal to the average rate from time $t_2$ to $t_4$? (Assume each ball represents $0.05$ mol of each substance.)
\textit{[Figure: Four containers at $t_1=0$ min, $t_2=20$ min, $t_3=40$ min, $t_4=60$ min showing black dots (A) and white dots (B)]}
\begin{tabular}{ll}
(1) $1/5\ ,\ 7/5\times10^{-3}$ & (2) $1/5\ ,\ 1/875\times10^{-3}$ \\
(3) $3\ ,\ 1/875\times10^{-3}$ & (4) $3\ ,\ 7/5\times10^{-3}$
\end{tabular}