Answer
75 days.
Work Step by Step
Half-life $t_{1/2}=\frac{0.693}{k}$ where $k$ is the rate constant.
That is, $t_{1/2}=\frac{0.693}{9.3\times10^{-3}\,d^{-1}}=75\,d$
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 18 - Nuclear Chemistry - Problem Solving Practice 18.5 - Page 798: a
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