Krypton-81 has a half-life of 2.29 × 105 years. A 750-mg sample of Krypton-81 undergoes electron capture. a. Write the reaction involving the electron capture of Krypton-81. b. How many half-lives would it take for the initial amount of Krypton-81 to become 2.9297 mg? Report your answer to the nearest whole number. c. Using the complete value of your answer in b, how many years would it take for the initial amount of Krypton- 81 to become 2.9297 mg? d. After 5.0 × 105 years, how much of the sample of Krypton-81 would remain?
Krypton-81 has a half-life of 2.29 × 105 years. A 750-mg sample of Krypton-81 undergoes electron capture. a. Write the reaction involving the electron capture of Krypton-81. b. How many half-lives would it take for the initial amount of Krypton-81 to become 2.9297 mg? Report your answer to the nearest whole number. c. Using the complete value of your answer in b, how many years would it take for the initial amount of Krypton- 81 to become 2.9297 mg? d. After 5.0 × 105 years, how much of the sample of Krypton-81 would remain?
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter18: The Nucleus: A Chemist's View
Section: Chapter Questions
Problem 43E
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Krypton-81 has a half-life of 2.29 × 105 years. A 750-mg sample of Krypton-81 undergoes electron capture.
a. Write the reaction involving the electron capture of Krypton-81.
b. How many half-lives would it take for the initial amount of Krypton-81 to become 2.9297 mg? Report
your answer to the nearest whole number.
c. Using the complete value of your answer in b, how many years would it take for the initial amount of Krypton-
81 to become 2.9297 mg?
d. After 5.0 × 105 years, how much of the sample of Krypton-81 would remain?
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