A) evaluating rate constant at standard temperature
B) evaluating velocities of reaction at two different temperatures
C) evaluating rate constants at two different temperatures
D) changing concentration of reactants
Correct Answer: C
Solution :
Activation energy can be calculated by using Arrhenius equation. The Arrhenius equation is- \[\log \frac{{{k}_{2}}}{{{k}_{1}}}=\frac{{{E}_{a}}}{2.303\,R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\] where \[{{k}_{1}}\] and \[{{k}_{2}}\] = rate constant at two different temperatures \[{{E}_{a}}\] \[=\] Activation energy R = Gas constant So, activation energy of a chemical reaction can be determined by evaluating rate constants at two different temperatures.
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