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Iodine-131 has a half life of 2.2 × 10-2 year. How long will it take to reduce a 130 g sample of 131I to 74 g 131I?

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k = 0.693/t1/2
ln(No/N) = kt
No = 130 g
N = 74 g
k = from above
Solve for t in years.
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