Radioactive Decay - Moles?

Palladium-107 undergoes Beta decay (half-life=6.5E5 yrs.) to form Silver-107. How long will it take for .150 moles of Ag-107 to form from 1.25 moles of Pd-107?





Correct Answer: 1.2E5 yrs





Any idea on how I'd go about doing this? I've tried plugging the moles directly into the formula:





ln(Ao/At)=kt, but I keep getting the wrong answer...





Thanks!

Radioactive Decay - Moles?
You used the natural logarithm.


Then k is 1 /relaxation time.


If you use base 10 you can use k = 1 / half life





Th

night jasmine