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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Ответ:
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
Ответ: