engineering chemistry MCQ #4902

The reaction A -> B is first-order with k = 0.02 min^-1. If [A]0 = 1 M, [A] at t = 50 min is

engineering chemistry MCQ #4902

  1. Question 1

    Q1. The reaction A -> B is first-order with k = 0.02 min^-1. If [A]0 = 1 M, [A] at t = 50 min is

    • A) 0.368 M
    • B) 0.135 M
    • C) 0.368 M (2)
    • D) 0.5 M

    Answer: 0.368 M

    Explanation: For first-order, [A] = [A]0 * e^(-kt) = 1 * e^(-0.02*50) = e^(-1) = 0.368 M.