Asked by CJ

An unknown substance decays from 14 g to 3 g over a period of 21 days.
Answered by oobleck
3/14 = (1/2)^2.22
so 21 days is 2.22 half-lives

I assume that has something to do with what you want to know...
Answered by DrBob222
Good for oobleck. I don't see a question.
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