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Concentration Changes Over Time

AP Chemistry· difficulty 2/5

Decomposition of N2O5 yields a linear ln[A] vs t plot with slope of -0.025 s^-1.

time (s) ln[A] ln[A] vs t (linear)

Identify the order and rate constant.

  • A

    Zero order; k = 0.025 M/s

  • B

    Second order; k = 0.025 M^-1 s^-1

  • C

    First order; k = -0.025 s^-1

  • D

    First order; k = 0.025 s^-1

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Explanation

Linear ln[A] vs t with slope -k means first order. k = 0.025 s^-1.

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