General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 20 - Nuclear Chemistry - Questions and Problems - Page 867: 20.12

Answer

Please see the work below.

Work Step by Step

As we know that $Ar^{40}_{18}$ was produced by radioactive decay of $K^{40}_{19}$, half the initial amount of $K^{40}_{19}$ has decomposed. Thus, the age equals the half life of $1.28\times 10^9y$.
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