Question

The activation energy of a chemical reaction can be determined by

• A. Evaluating rate constant at standard temperature
• B. Evaluating velocities of reactions at two different temperature
• C. Evaluating rate constants at two different temperature
• D. The changing concentration of reactants

Answer 1

The correct option is C Evaluating rate constants at two different temperature

According to Arrhenius equation,
$k=A{e}^{-\frac{E_a}{RT}}$
$\therefore ln\frac{k_2}{k_1}=\frac{E_a}{R}(\frac{1}{T_1}-\frac{1}{T_2})$
Where,
$k_2=\text{Rate constant at temperature}{T}_2$
$k_1=\text{Rate constant at temperature}{T}_1$
$E_a=\text{Activation energy}$
So activation energy can be determined by evaluating the rate constant at different temperatures using this equation.
So here the correct option is (C).