At a given temperature,a first-order reaction has a rate constant of 2.1 × 10^-3 s^-1.How long will it take for the reaction to be 25% complete?

Question

Quizplus · Accepted Answer

For a first-order reaction, the time to reach a certain completion can be calculated using the formula: t = (1/k) * ln(1/(1-fraction completed)). For 25% completion, fraction completed = 0.25. Plugging in the values: t = (1/2.1 × 10^-3) * ln(1/0.75) ≈ 140 s.

At a Given Temperature,a First-Order Reaction Has a Rate Constant