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Concentration Changes Over Time

AP Chemistry· difficulty 4/5

A first-order reaction has rate constant k=0.10k = 0.10 /s. Starting from [A]0_0 = 1.00 M, after 30 s [A] is closest to

  • A

    0.0 M

  • B

    0.50 M

  • C

    0.05 M (e−3=0.050e^{-3} = 0.050)

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  • D

    0.10 M

Explanation

First-order: [A]=[A]0e−kt=(1.00)e−(0.10)(30)=e−3=0.0498[A] = [A]_0 e^{-kt} = (1.00)e^{-(0.10)(30)} = e^{-3} = 0.0498 M.

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