Concentration Changes Over Time

AP Chemistry· difficulty 2/5

A first-order reaction has k = 0.0231 s⁻¹. Its half-life is approximately

A
$10 s$
B
$60 s$
C
$20 s$
D
$30 s$
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Explanation

t₁/₂ = 0.693/k = 0.693/0.0231 \approx 30 s.

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