Chemistry
posted by Taylor .
The halflife of iodine 131 is 16 days. If you start with 100 gram sample, how many halflives have past when you have less than a gram left?

Chemistry 
DrBob222
2^{n} = No/N.
No = 100
N = 1. Solve for n.
I get n  6.64 half lives which means you need 7 half lives to get to less than 1 g. Six half lives leaves 1.56 g.
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