1.Element F has a quarter life of 10 hrs. If there are 925 milligrams remaining of element F after the time equivalent to thrice the half life, how many kilograms of element F are present initially? 2. Substance Q initially weighs 120% of its remaining mass after its decay in 60 minutes. What is the half life in hours?

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Chapter10: Radioactivity And Nuclear Processes
Section: Chapter Questions
Problem 10.83E
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1.Element F has a quarter life of 10 hrs. If there are 925 milligrams remaining of element F after the time equivalent to thrice the half life, how many kilograms of element F are present initially?

2. Substance Q initially weighs 120% of its remaining mass after its decay in 60 minutes. What is the half life in hours? 

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