Chapter 9, Problem 85P

Interpretation Introduction

Interpretation: The half-life of oxygen-15 is given 124 seconds. The activity of sample of oxygen-15 is given 6000 Bq. The time in minutes before it has an activity of 375 Bq needs to be calculated.

Concept Introduction: The integrated rate law for first order reaction is represented as follows:

$k=\frac{2.303}{t}\log \frac{\left[A_o\right]}{\left[A_t\right]}$

Here, k is rate constant, $\left[A_o\right]$ is initial amount and $\left[A_t\right]$ is final amount of the sample.