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April 18, 2015

April 18, 2015

Posted by **dela** on Tuesday, October 12, 2010 at 8:21pm.

- chemistry -
**DrBob222**, Tuesday, October 12, 2010 at 8:54pmk = 0.693/t

_{1/2}

k = 0.693/25 min = ??

Substitute k into the equation below.

ln(No/N) = kt

No = 7 mg

N = unknown

k = from above.

t = 116 minutes.

Solve for N.

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