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January 25, 2015

January 25, 2015

Posted by **Cece** on Monday, December 5, 2011 at 4:18pm.

- chemistry -
**DrBob222**, Monday, December 5, 2011 at 4:24pmI think this is the easiest way.

k = 0.693/t_{1/2}and substitute k into the following:

ln(No/N) = kt.

I would call No = 100, then

N = 10 (if 90% is gone)

k from above

t = solve for this. The unit will be the unit used for the half life to solve for k.

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