MDCAT Chemistry MCQ #5125

A certain reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and that of B is tripled, the rate of reaction will increase by a factor of

MDCAT Chemistry MCQ #5125

  1. Question 1

    Q1. A certain reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and that of B is tripled, the rate of reaction will increase by a factor of

    • A) 6
    • B) 12
    • C) 18
    • D) 24

    Answer: 18

    Explanation: New rate = k(2[A])(3[B])^2 = k(2)(9)[A][B]^2 = 18k[A][B]^2, so it increases by a factor of 18.