42The half-life of 1K is 12.5 hrs. How much will remain after 65 hrs if the original19-sample contained 256 g of K?197.0 g11 g20 g24 g17 g

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Answered: 42 The half-life of 1K is 12.5 hrs. How…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter24: Nuclear Chemistry

Section: Chapter Questions

Problem 82A

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Fluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a half-life of 109.7 min. (A positron is a particle with the mass of an electron and a single unit of positive charge; the equation is F918O188+e+10 Physicians use 18F to study the brain by injecting a quantity of ?uoro-substituted glucose into the blood of a patient. The glucose accumulates in the regions where the brain is active and needs nourishment. (a) What is the rate constant for [lie decomposition of ?uorine-18? (b) If a sample of glucose containing radioactive fluorine-18 is injected into the blood, what percent of the radioactivity will remain after 5.59 h? (c) How long does it take for 99.99% of the 18F to decay?

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42 The half-life of 1K is 12.5 hrs. How much will remain after 65 hrs if the original 19- sample contained 256 g of K? 19 7.0 g 11 g 20 g 24 g 17 g