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15 May, 15:29

After 24.0 days, 2.00 milligrams of an original 128.0 milligram sample remain. what is the half-life of the sample?

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  1. 15 May, 19:26
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    (1/2) n = 0.015625

    n log 0.5 = log 0.015625

    n = log 0.5 / log 0.015625

    n = 6 24 days / 6 half-lives = 4.00 days (the length of the half-life)
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