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Concentration Changes Over Time

AP Chemistry· difficulty 2/5

A first-order reaction has k = 0.0231 s^-1.

[A] vs t

What is the half-life?

  • A

    21.7 s

  • B

    0.0231 s

  • C

    Cannot determine without [A]0

  • D

    30.0 s

    check_circle

Explanation

For first order: t1/2 = ln(2)/k = 0.693 / 0.0231 ≈ 30.0 s.

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