engineering chemistry MCQ #4931

For a first-order reaction, the rate constant is 0.02 min-1. What is the time required for 90% completion?

engineering chemistry MCQ #4931

  1. Question 1

    Q1. For a first-order reaction, the rate constant is 0.02 min-1. What is the time required for 90% completion?

    • A) 115.13 min
    • B) 100 min
    • C) 120 min
    • D) 150 min

    Answer: 115.13 min

    Explanation: For a first-order reaction, t = (ln([A]0/[A])) / k = (ln(100/10)) / 0.02 = 115.13 min.