For the Second-Order Reaction Between Methyl Iodide, CH₃I, and Thiosulfate

Multiple Choice

For the second-order reaction between methyl iodide, CH₃I, and thiosulfate ions, S₂O₃^2-, ions in water, the Arrhenius pre-exponential factor is 2.19  10¹² dm³ mol^-1 s^-1 and the activation energy is 78.7 kJ mol^-1. Calculate the rate constant for the reaction at a temperature of 25°C.

A) 1.59  10^-3 dm³ mol^-1 s^-1
B) 2.19  10¹² dm³ mol^-1 s^-1
C) 2.12  10¹² dm³ mol^-1 s^-1
D) 0.035 dm³ mol^-1 s^-1