engineering chemistry MCQ #4952

For the reaction A -> products, the rate constant is 2 x 10^-3 s^-1. If the initial concentration of A is 1 M, what is the concentration after 100 s?

engineering chemistry MCQ #4952

  1. Question 1

    Q1. For the reaction A -> products, the rate constant is 2 x 10^-3 s^-1. If the initial concentration of A is 1 M, what is the concentration after 100 s?

    • A) 0.82 M
    • B) 0.67 M
    • C) 0.5 M
    • D) 0.33 M

    Answer: 0.82 M

    Explanation: For a first-order reaction, [A] = [A0]e^(-kt) = e^(-2 x 10^-3 x 100).