engineering chemistry MCQ #4926

For a first-order reaction, the rate constant is 0.05 min-1. What is the time required for 75% completion?

engineering chemistry MCQ #4926

  1. Question 1

    Q1. For a first-order reaction, the rate constant is 0.05 min-1. What is the time required for 75% completion?

    • A) 27.72 min
    • B) 20 min
    • C) 30 min
    • D) 40 min

    Answer: 27.72 min

    Explanation: For a first-order reaction, t = (ln([A]0/[A])) / k = (ln(100/25)) / 0.05 = 27.72 min.