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A freshly isolated sample of 90Y was found to have an activity of 8.5 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on 90 December 17, 2006, its activity was measured again and found to be 2.3 × 10 disintegrations per minute. Calculate the half-life of Y. Round your answer to 2 significant digits.

A freshly isolated sample of 90Y was found to have an activity of 8.5 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on 90 December 17, 2006, its activity was measured again and found to be 2.3 × 10 disintegrations per minute. Calculate the half-life of Y. Round your answer to 2 significant digits.

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter20: Nuclear Chemistry
Section: Chapter Questions
Problem 20.20QP
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90 A freshly isolated sample of 90Y was found to have an activity of 8.5 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be 2.3 × 104 disintegrations per minute. Calculate the half-life of Y. Round your answer to 2 significant digits.
Transcribed Image Text:90 A freshly isolated sample of 90Y was found to have an activity of 8.5 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be 2.3 × 104 disintegrations per minute. Calculate the half-life of Y. Round your answer to 2 significant digits.
Consider the decay series A B C → D in which A, B, and C are radioactive isotopes with half-lives of 4.50 seconds, 15.0 days, and 1.00 seconds, respectively, and D is nonradioactive. Starting with 1.06 mole of A, and none of B, C, or D, calculate the number of moles of A, B, C, and D left after 30 days. Round each of your answers to 2 significant digits.
Transcribed Image Text:Consider the decay series A B C → D in which A, B, and C are radioactive isotopes with half-lives of 4.50 seconds, 15.0 days, and 1.00 seconds, respectively, and D is nonradioactive. Starting with 1.06 mole of A, and none of B, C, or D, calculate the number of moles of A, B, C, and D left after 30 days. Round each of your answers to 2 significant digits.
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