試題詳解

14. Rate of an uncatalyzed first-order reaction at 300 K is balf of the rate of catalyzed reaction at 1 50 K. Ifthe catalyst lowers the threshold energy by 20 kcal, what is the activation energy of the uncatalyzed reaction?
(A) 39.58 kcal/mol,
(B) 19.58 kcal/mol,
(C) 40.42 kcal/mol,
(D) 20.42 kcal/mol.
(E) 56.68 kcal/mol.