# Chemistry

If radon-222 has a half-life of 3.8 days, determine how long it takes for only 1/8 of a sample to remain.

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1. Find k from the following.
k = 0.693/t1/2

Then substitute into the following
ln(No/N) = kt
Use a convenient number for No, then N will be 1/8 of that, solve for t.

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posted by DrBob222

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