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Chemistry · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 1 · Q28
The rate of a gaseous reaction triples when temperature is increased from 17^° C to 27^° C. Calculate the energy of activation for this reaction.…
The rate of a gaseous reaction triples when temperature is increased from $\displaystyle 17^{\circ} \mathrm{C}$ to $\displaystyle 27^{\circ} \mathrm{C}$. Calculate the energy of activation for this reaction. [Given : $\displaystyle 2.303 \mathrm{R}=19 \cdot 15 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}, \log 3=0 \cdot 48$ ]
Marking-scheme solution
\[\begin{aligned}
& \log \frac{k_{2}}{k_{1}}=\frac{\mathrm{E}_{\mathrm{a}}}{2 \cdot 303 \mathrm{R}}\left[\frac{1}{\mathrm{T}_{1}}-\frac{1}{\mathrm{T}_{2}}\right] \text { or } \frac{\mathrm{E}_{\mathrm{a}}}{2 \cdot 303 \mathrm{R}}\left[\frac{\mathrm{~T} 2-\mathrm{T} 1}{\mathrm{T}_{1} \mathrm{T} 2}\right] \\
& \log \frac{3 k_{1}}{k_{1}}=\frac{\mathrm{E}_{\mathrm{a}}}{19 \cdot 15}\left[\frac{1}{290}-\frac{1}{300}\right] \\
& 0 \cdot 48=\frac{\mathrm{E}_{\mathrm{a}}}{19 \cdot 15}\left[\frac{10}{290 \times 300}\right] \\
& \mathrm{E}_{\mathrm{a}}=\frac{0 \cdot 48 \times 19 \cdot 15 \times 290 \times 300}{10} \\
& \mathrm{E}_{\mathrm{a}}=79970 \mathrm{Jmol}^{-1} \mathrm{or}^{2} 9.970 \mathrm{kJmol}^{-1}
\end{aligned}
\]
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