If the half life is 6.3 minutes how much of a 128.0 milligram sample will remain after 15 minutes

24.5

Explanation:

15/6.3 => 2.38 half lives passed.

.5^2.38 => 0.19198 decimal representation of the percentage that is left over after 2.38 half lives have passed.

0.19198 *128 = 24.5 mg of the material remaining.

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answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;