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OpenStudy (anonymous):
A certain radioactive element has a half-life of one hour. If you start with 20.0 grams of the element at noon, how much of the radioactive element will be left at 3 p.m.?
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OpenStudy (anonymous):
10.0 grams 5.0 grams 2.5 grams 1.25 grams
OpenStudy (anonymous):
i do not know how to calculate these at all so if you dont mind can you show me please
OpenStudy (anonymous):
i think its 2.5
OpenStudy (abmon98):
Mass=20 g Half life=1 hour Elapsed time= 3 hour Final amount=Intial amount/2^n n=(elapsed time/Half life) You are right its 2.5
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