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Concentration Changes Over Time

AP Chemistry· difficulty 4/5

For a second-order reaction with k=0.50k = 0.50 M−1^{-1} s−1^{-1} and [A]0_0 = 0.20 M, the half-life is

  • A

    10 s (t1/2=1/(k[A]0)t_{1/2} = 1/(k[A]_0))

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  • B

    0.7 s

  • C

    1.4 s

  • D

    Cannot determine

Explanation

Second-order t1/2=1/(k[A]0)=1/((0.50)(0.20))=10t_{1/2} = 1/(k[A]_0) = 1/((0.50)(0.20)) = 10 s. Note t1/2t_{1/2} depends on initial concentration.

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