For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J

Q. For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol^-1 K^-1, the value of activation energy (in kJ/mol) is

(A) 10.5                      (B) 12.0                      (C) 15.2                     (D) 18.4

Ans: 15.2