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The decomposition of \( \mathrm{H}_{2} \mathrm{O}_{2} \) follows first order kinetics:
\[
\mathrm{H}_{2} \mathrm{O}_{2(\mathrm{aq})} \longrightarrow \mathrm{H}_{2} \mathrm{O}_{(i)}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})}
\]
P
W
In order to determine the rate constant of reaction, a definite volume of reaction mixture is titrated with standard \( \mathrm{KMnO}_{4} \) solution, at different time. What is the value of ' \( \mathrm{X} \) ' in the following data?
\begin{tabular}{|l|l|l|l|}
\hline Time \( (\min ) \) & 0 & 10 & 20 \\
\hline Volume of \( \mathrm{KMnO}_{4} \) & 25 & 20 & \( \mathrm{X} \) \\
\hline
\end{tabular}
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