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Chemistry
The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be (R = 8.314 JK-1 mol-1 and log 2 = 0.301)
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Q. The rate of a reaction doubles when its temperature changes from $300\, K$ to $310\,K$. Activation energy of such a reaction will be $(R = 8.314 JK^{-1} \,mol^{-1}$ and $log \,2 = 0.301)$
JEE Main
JEE Main 2013
Chemical Kinetics
A
$53.6\, kJ \,mol^{-1}$
58%
B
$48.6\, kJ \,mol^{-1}$
17%
C
$58.5\, kJ \,mol^{-1}$
20%
D
$60.5\, kJ \,mol^{-1}$
5%
Solution:
From Arrhenius equation, $\log \frac{k_2}{k_1}=\frac{-E_a}{2.303 R}\bigg(\frac{1}{T_2}-\frac{1}{t_1}\bigg)$
Given, $\frac{k_2}{k_1}=2T_2=310\,K$
$T_1=300\,K$
On putting values,
$\Rightarrow \log 2=\frac{-E_a}{2.303\times8.314}\bigg(\frac{1}{310}-\frac{1}{300}\bigg)$
$\Rightarrow E_a=53598.6 J \, = 53.6\, kJ \,mol^{-1}$