Concentration Changes Over Time

AP Chemistry· difficulty 3/5

The line ln[A] vs t passes through (0, 0.00) and (200, -1.00).

t (s) ln[A]

What is k for this first-order reaction?

  • A

    200 s

  • B

    -5.0 × 10^-3 s^-1

  • C

    5.0 × 10^-3 s^-1

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  • D

    1.0 × 10^-2 s^-1

Explanation

slope = -k = (-1 - 0)/(200 - 0) = -0.005 s^-1, so k = 5.0 × 10^-3 s^-1.

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