# chemistry

how many half-lives of radon-222 have passed in 11.46 days?

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asked by Jerry
1. 1/8 =(1/2)^n 0.25=0.5^n log0.25=log0.5^n log0.25=nlog0.5 n=log0.25/log0.5=3:::::there4 it is 3 half-lifes

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