Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 25 - Nuclear Chemistry - 25 Assessment - Page 903: 89

Answer

2135.

Work Step by Step

First, you have to calculate how many half-lives are required for it to reach 17 counts per minute. Simply divide 544 counts in half again and again until you reach 17. Therefore, 5 half-lives is required. 30 years times 5 half lives = 150 years + 1985 = 2135. The half-live is given by 30 years. Multiply that by 5 half-lives to get 150 years and add that on to the given date of 1985.
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