Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0321908449
ISBN 13: 978-0-32190-844-5

Chapter 5 - Section 5.6 - Nuclear Fission and Fusion - Challenge Questions - Page 163: 5.82

Answer

15 hours.

Work Step by Step

$2.0\,\mu g=16\,\mu g\times\frac{1}{2}\times\frac{1}{2}\times\frac{1}{2}$ $16\,\mu g$ decays to $2.0\,\mu g$ in 3 half-lives. $\implies 3.0\,\text{half-lives}=45\,\text{hours}$ Or half-life $t_{1/2}=\frac{45\,hours}{3.0}=15\,hours$
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