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January 29, 2015

January 29, 2015

Posted by **David** on Tuesday, December 11, 2012 at 11:26pm.

- Chemistry -
**DrBob222**, Tuesday, December 11, 2012 at 11:33pmYou need the rate constant which is

k = 0.694/t_{1/2>/sub> Substitute k into the equation below. ln(No/N) = kt. No is what you wnat to know. N = 12.5g from the problem. k from above. t = 2.82E9 yr. Substitute and solve for N. }

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