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September 18, 2014

September 18, 2014

Posted by **Jennifer** on Sunday, November 6, 2011 at 1:59am.

- Chemistry -
**DrBob222**, Sunday, November 6, 2011 at 2:01pmk = 0.693/t

_{1/2}

Solve for k and substitute into the equation below.

ln(No/N) = kt.

No = atoms to start.

N = atoms left

k from above.

t = time.

There is no No to start; the problem asks for the fraction left or N/No; therefore, you want to solve for No/N and take the reciprocal.

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