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Introduction to Rate Law

AP Chemistry· difficulty 4/5

For 2NO+O2→2NO22NO + O_2 \rightarrow 2NO_2: doubling [NO] quadruples rate; doubling [O2][O_2] doubles rate. Initial rate is 0.025 M/s when [NO] = 0.10 M and [O2][O_2] = 0.10 M. Find kk.

  • A

    k=25k = 25 M−2^{-2}s−1^{-1}

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  • B

    k=250k = 250 M−2^{-2}s−1^{-1}

  • C

    k=0.025k = 0.025 M−1^{-1}s−1^{-1}

  • D

    k=2.5k = 2.5 M−2^{-2}s−1^{-1}

Explanation

Rate = k[NO]2[O2]k[NO]^2[O_2]. kk = 0.025/((0.10)2^2(0.10)) = 0.025/0.001 = 25 M−2^{-2}s−1^{-1}.

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