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the radioisotope radon-222 has a half-life of 3.8 days. how much of a 65-g sample of radon-222 would be left after approximately 15 days?
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the radioisotope radon-222 has a half-life of 3.8 days. how much of a 65-g sample of radon-222 would be left after approximately 15 days?

User Spieden
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Use the 1st order decay equation
Cfinal=Cinitiale−kt
by filling in and doing the math you will get:

Cfinal = 1.11 grams Rn-222 after 23 days.

hope this helps

User Aram Mkrtchyan
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