Question

If activation energy, $E_{a} \, $ of the reaction is equal to $RT$ then

• A. The rate of reaction will be independent on initial concentration of reactant.
• B. The rate constant becomes approximately equal to $37\%$ of the Arrhenius constant
• C. The rate of reaction becomes infinite
• D. The rate of reaction always be first order.

Answer 1

Answer: (B)

$k=A \, e^{- E_{a} / R T}$
When $E_{a}=RT$ , then $k=\frac{A}{e}=\frac{A}{2.718} \, \overset{\sim }{-} \, 0.37 \, A$
The rate constant becomes approximately equal to 37% of the Arrhenius constant