21. Nuclear Chemistry
Radioactive Half-Life
5:14 minutes
Problem 91
Textbook Question
Textbook QuestionThe half-life of 238U is 4.5 * 109 yr. A sample of rock of mass 1.6 g produces 29 dis>s. Assuming all the radioactivity is due to 238U, find the percent by mass of 238U in the rock.
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