Posted by **Anonymous** on Sunday, June 10, 2012 at 4:11am.

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 48.1 g of 32P, how much 32P was present 3.00 days ago?

- Chemistry -
**DrBob222**, Sunday, June 10, 2012 at 12:46pm
Using half-life, calculate rate constant, k, from the following

k = 0.693/t_{1/2, then substitute k into the following
ln(No/N) = kt
No = unknown
N = 48.1 g.
k from above.
t = 3 days.
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