Question

How long will it take for a 18.0-g sample of iodine-131 to decay to leave a total of 2.25 g of the isotope? The half-life of iodine-131 is 8.07 days
k = 0.693/t<sub>1/2</sub>

Then ln(No/N) = kt
No = 18/-
N = 2.25
k from above.
Solve for t.
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