Answer
19.6%
Work Step by Step
2013-1945 = 68 year difference
68/28.9 = 2.353 half lives occur
(0.5)^2.353 = 0.196
19.6%
Chemistry 9th Edition
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1133611095
ISBN 13:
978-1-13361-109-7
Chapter 19 - The Nucleus: A Chemist's View - Exercises - Page 921: 31
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