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August 28, 2015

Homework Help: Chemistry (Dr.Bob222)

Posted by K on Thursday, November 7, 2013 at 5:41pm.

The half-life of P-32 is 14 days. How long after a sample is delivered can a laboratory wait to use a sample in an experiment if they need at least 10 percent of the original radioactivity?

I need help on how to set up this problem. What is the general equation to use for a half-life problem? And a question specific to the problem, is how to I find 10% of the original?

Thanks for your help.

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