Concentration Changes Over Time

AP Chemistry· difficulty 4/5

A first-order reaction has a half-life of 100 s. After 400 s, the fraction of reactant remaining is

A
$\frac{1}{16}$
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B
$\frac{1}{8}$
C
$\frac{1}{4}$
D
$\frac{1}{2}$

Explanation

(1/2)^4 = 1/16

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