Posted by **m** on Tuesday, March 5, 2013 at 8:57pm.

I've figured out most of it. I'm not sure how to find the percentage ofd the isotope.

Define the half life. The half-life of a radioisotope is found to be 4.55 minutes. If the decay follows first order kinetics, what percentage of isotope will remain after 2.00 hours if you start with 10.00 g?

T1/2= (.693)/k 4.55min = (.693)/k k =.152min-1

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