Chapter 9, Problem 83P

Interpretation Introduction

Interpretation: The initial sample of radioactive iodine-123 is given 0.4 mg. The amount after 26.4 hours is given 0.1 mg. The half-life of iodine-123 needs to be determined.

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.