Homework Help: chemistry

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

use the nuclear decay equation to find out how much a 7mg sample of iodine 128 remains after 116 minutes if the half life of this isotope is 25 minutes.

chemistry - DrBob222, Tuesday, October 12, 2010 at 8:54pm
k = 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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