Introduction to Rate Law

AP Chemistry· difficulty 4/5

A new reaction X + 2Y → Z gives the data shown.

Trial [X] [Y] Rate (M/s) 1 0.05 0.05 1.0×10⁻⁴ 2 0.05 0.10 4.0×10⁻⁴ 3 0.10 0.05 2.0×10⁻⁴

What is the rate law?

  • A

    rate = k[X][Y]²

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  • B

    rate = k[X][Y]

  • C

    rate = k[Y]²

  • D

    rate = k[X]²[Y]

Explanation

Trials 1→2: [Y] doubles, rate ×4 ⇒ order 2 in Y. Trials 1→3: [X] doubles, rate ×2 ⇒ order 1 in X. rate = k[X][Y]².

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