Introduction to Rate Law

AP Chemistry· difficulty 3/5

For the reaction A + B → C, initial-rate data are collected.

Trial [A] [B] Rate (M/s) 1 0.10 0.10 2.0×10⁻³ 2 0.20 0.10 8.0×10⁻³ 3 0.10 0.20 2.0×10⁻³

What is the rate law?

  • A

    rate = k[A]²

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  • B

    rate = k[A][B]²

  • C

    rate = k[A][B]

  • D

    rate = k[A]²[B]

Explanation

Trials 1→2: [A] doubles, rate ×4 ⇒ order 2 in A. Trials 1→3: [B] doubles, rate unchanged ⇒ order 0 in B. rate = k[A]².

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