Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning

Chapter 18 - Nuclear Chemistry - Questions for Review and Thought - Topical Questions - Page 817b: 28

5 mg

Work Step by Step

t= 24 hours+6 hours= 30 hours=2 half-lives. After one half-life $\frac{1}{2}\times20\,mg$ remains. After two half-lives $\frac{1}{2}\times\frac{1}{2}\times20\,mg$ remains. That is, 5 mg remains.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.