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6 February, 14:14

what is the half life isotope if after 21 days you have 31.25 g remaining from a 250.0 g starting sample size?

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  1. 6 February, 14:24
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    250 - -> 125 - -> 62.5 - -> 31.25

    each arrow equals one half life, so 3 half lives

    14 days / 3 half lives =

    4.67 days = half life
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