Answer
$t_{1/2}=36.0\ s$
Work Step by Step
For first-order reactions:
$\ln(C/C_0)=-kt=-0.693/t_{1/2}\times t$
$\ln 0.25=-0.693/t_{1/2}\times 72\ s$
$t_{1/2}=36.0\ s$
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 14 Chemical Kinetics: The Rates of Chemical Reactions - Study Questions - Page 553e: 53
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