The half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes has elapsed?

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The half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the inception, how manifold grams would be left succeeding 7.2 minutes has late?
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