Answer
40 days is 5 half-lives. $6.3\times10^{-1}$ mg is left after these 5 half-lives.
Work Step by Step
40 days is 5 half-lives. $6.3\times10^{-1}$ mg is left after these 5 half-lives.
Chemistry (12th Edition)
by Wilbraham
Published by
Prentice Hall
ISBN 10:
0132525763
ISBN 13:
978-0-13252-576-3
Chapter 25 - Nuclear Chemistry - 25 Assessment - Page 900: 47
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