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Homework Help: Rate Laws - Pseudo-Order

  1. Feb 12, 2012 #1
    1. The problem statement, all variables and given/known data
    2A + 2B -> C +D
    where rate = k [A] ^2
    [A]_0 = .000443 M
    _0 = 1.69 M
    A plot of ln [A] vs time has a slope of -9.87. What will the rate of this reaction be when [A]==1.412 M?

    2. Relevant equations

    3. The attempt at a solution
    From given information, this is pseudo-first order. So slope=-k so k = 9.87 but this is pseudo-order so k'= 9.87

    rate= k' [A]
    k' = k ^2 --> k = k' / ^2 and I plug in the values for k' and = 1.412 and I get the wrong answer. The answer should be 9.73 M/s
  2. jcsd
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