Homework Help: chemistry

Posted by mary on Friday, December 23, 2011 at 2:03pm.

5 mg iodine 131 its half life is 8.1 days what is the time when 1% remain

chemistry - DrBob222, Friday, December 23, 2011 at 3:08pm
k = 0693/t_1/2
Solve for k and substitute into the equation below.

ln(No/N) = kt
Use 5mg for No.
Use 1% x 5 = 0.05 for N.
k from above.
Solve for t.
t will be in days if you used 8.1 days for the half-life.

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