Asked by Chemistry

The half-life of rubidium-87 (natural absorbance 27.83%) is 5.1x10^11 years. What mass of rubidium is present if an average sample decay rate of 35.0 disint./sec is detected?

I've already converted years to seconds but not sure what to do after..

Answers

Answered by Steve
Not sure what the absorbance has to do with things, but
a half-life of 5.1*10^11 years is a decay rate of
1.359*10^-10 % per year = 4.31*10^-18 % per second
so, if 35 per second is 4.31*10^-20 of the number of atoms, that means that you have
8.05*10^20 atoms, or 0.00133 moles

Not sure whether this helps ...

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