The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.085 M, it takes ________ min for it to decrease to 0.055 M.

Question

Quizplus · Accepted Answer

For a first-order reaction, the time taken to decrease from an initial concentration [A]₀ to a concentration [A] is given by the formula t = (1/k) * ln([A]₀/[A]), where k is the rate constant. The rate constant k can be calculated using the half-life formula k = 0.693/t₁/₂. Substituting the given values, we find that it takes approximately 8.2 minutes.

The Half-Life of a First-Order Reaction Is 13 Min