Answer
690 hours.
Work Step by Step
Rate constant $k=1.0\times10^{-3}\,h^{-1}$
Half-life $t_{1/2}=\frac{\ln 2}{k}=\frac{0.693}{1.0\times10^{-3}\,h^{-1}}=690\,h$
Chemistry: Atoms First (2nd Edition)
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1305079248
ISBN 13:
978-1-30507-924-3
Chapter 18 - Exercises - Page 750b: 25
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