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September 23, 2014

September 23, 2014

Posted by **Sarah H** on Friday, March 28, 2008 at 5:34pm.

I got: close to 15 days. Is this right?

I figured that about 1% of the original quantity would be roughly 6.5 Half lives, and since a half life is 2.35 days, 6.58*2.35

- Gen Chem -
**DrBob222**, Friday, March 28, 2008 at 5:52pmIt's done this way for an exact answer.

k = 0.693/t_{1/2}. Substitute k into the following equation and solve for t.

ln(100/1) = kt.

I get 15.6 days.

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