A given first-order reaction has a rate constant of 0.00300 s^-¹ .The time required for 85% reaction is A) 632 s. B) 23.5 s. C) 275 s. D) 316 s. E) 54.2 s.

Question

Quizplus · Accepted Answer

For a first-order reaction, the time required for a certain percentage of reaction can be calculated using the formula $t = \frac{\ln(\frac{100}{100-x})}{k}$, where $x$ is the percentage of reaction and $k$ is the rate constant. For 85% reaction, $x = 85$, so $t = \frac{\ln(\frac{100}{15})}{0.00300} = 632 s$.

A Given First-Order Reaction Has a Rate Constant of 0