engineering chemistry MCQ #4927

The rate constant for a reaction is 0.02 s-1. If the initial concentration is 1 M, what is [A] after 50 s?

engineering chemistry MCQ #4927

  1. Question 1

    Q1. The rate constant for a reaction is 0.02 s-1. If the initial concentration is 1 M, what is [A] after 50 s?

    • A) 0.37 M
    • B) 0.25 M
    • C) 0.1 M
    • D) 0.05 M

    Answer: 0.37 M

    Explanation: For a first-order reaction, [A] = [A]0 * e^(-kt) = 1 * e^(-0.02*50) = e^(-1) = 0.37 M.