The concentration of $R$ in the reaction $R \rightarrow P$ was measured as a function of time and th

Question

The concentration of $R$ in the reaction $R ightarrow P$ was measured as a function of time and the following data is obtained. $$\begin{tabular}{|l|l|l|l|l|} \hline $[R]$ (molar) & 1.0 & 0.75 & 0.40 & 0.10 \ \hline $t$ (min.) & 0.0 & 0.05 & 0.12 & 0.18 \ \hline \end{tabular}$$ The order of the reaction is _______ .

Professor PC Thomas Classes · Answer

(0) : For the given reaction, $$\begin{align*} & -\frac{d[R]}{d t}=-\left(\frac{0.75-1}{0.05-0}ight)=\frac{0.25}{0.05}=5  	ag{i}\ & -\frac{d[R]}{d t}=-\left(\frac{0.40-0.75}{0.12-0.05}ight)=\frac{0.35}{0.07}=5 	ag{ii} \end{align*}$$ Thus, the value of $\frac{d[R]}{d t}=k$ is constant, and the reaction follows zero order kinetics.\