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Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s-1? s-1 (b) A sample contains 22.0 mg 178w. How many decay events will be produced in the first second? Assume that the atomic mass of 178W is 178. decay events (c) A chemist obtains a fresh sample of 178W and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25.0% of the initial measured value. How long does she have to perform the experiment?

Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s-1? s-1 (b) A sample contains 22.0 mg 178w. How many decay events will be produced in the first second? Assume that the atomic mass of 178W is 178. decay events (c) A chemist obtains a fresh sample of 178W and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25.0% of the initial measured value. How long does she have to perform the experiment?

Chemistry: An Atoms First Approach
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 28E
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Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s-¹? S-1 (b) A sample contains 22.0 mg 178w. How many decay events will be produced in the first second? Assume that the atomic mass of 178W is 178. decay events (c) A chemist obtains a fresh sample of 178W and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25.0% of the initial measured value. How long does she have to perform the experiment? days
Transcribed Image Text:Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s-¹? S-1 (b) A sample contains 22.0 mg 178w. How many decay events will be produced in the first second? Assume that the atomic mass of 178W is 178. decay events (c) A chemist obtains a fresh sample of 178W and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25.0% of the initial measured value. How long does she have to perform the experiment? days
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