A) changing the concentration of the reactants
B) evaluating the rate constant at standard temperature
C) evaluating the rate constant at two different concentrations
D) evaluating the rate constant at two different temperatures
E) by doubling the concentrations of the reactants
Correct Answer: D
Solution :
The activation energy of a reaction can be determined by evaluating the rate constant at two different temperatures. By knowing the values of rate constant (\[{{K}_{1}}\]and\[{{K}_{2}}\])of the reaction at temperatures\[{{T}_{1}}\]and \[{{T}_{2}}\]respectively, the value of activation energy \[({{E}_{a}})\]can be calculated with the help of following equation. \[\log \frac{{{K}_{2}}}{{{K}_{1}}}=\frac{{{E}_{a}}}{2.303R}\left[ \frac{1}{{{T}_{1}}}-\frac{1}{{{T}_{2}}} \right]\]
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