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(a) What mass of Na₂38SO4 has an activity of 11.7 mCi? Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 h. ng (b) How long does it take for 99.93% of a sample of sulfur-38 to decay? h

(a) What mass of Na₂38SO4 has an activity of 11.7 mCi? Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 h. ng (b) How long does it take for 99.93% of a sample of sulfur-38 to decay? h

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 30E
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The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7×10¹0 decay events per second (the number of decay events from 1 g of radium in 1 s). (a) What mass of Na₂³8SO has an activity of 11.7 mCi? Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 h. 4 ng (b) How long does it take for 99.93% of a sample of sulfur-38 to decay? h
Transcribed Image Text:The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to 3.7×10¹0 decay events per second (the number of decay events from 1 g of radium in 1 s). (a) What mass of Na₂³8SO has an activity of 11.7 mCi? Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 h. 4 ng (b) How long does it take for 99.93% of a sample of sulfur-38 to decay? h
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