Introduction to Rate Law

AP Chemistry· difficulty 4/5

For A + B -> P with rate = k[A][B], [B] is held in large excess. ln[A] vs t is linear.

t ln[A]

The observed rate constant k_obs equals:

  • A

    k/[B]0

  • B

    k/[A]0

  • C

    k

  • D

    k[B]0

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Explanation

With [B] ≈ [B]0 constant, rate = k[B]0[A] = k_obs[A], so k_obs = k[B]0.

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