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Involving Rate determining steps

  1. Nov 20, 2003 #1
    I have no idea how to figure this one out, I've been hacking away at it all evening. Please help :frown:

    Consider the general reaction:

    2A + B --> 2E + F

    The experimentally determined rate law equation is written as follows:

    Rate = k[A]

    A proposed mechanism for the reaction has the first step below:

    Step 1: A + B --> C + F (rate determinging step)

    Assuming a two-step mechanism, write a possible second elementary reaction for this mechanism.

    And this is what I have but I'm not sure if its right. And I'm totally puzzled as to how they get rid of the C.

    Step1: A + B --> C + F
    Step2: A --> C- + 2E
    2A + B --> 2E + F

    It has to be totally wrong since they've given me a rate law which I have no idea how to use.
  2. jcsd
  3. Nov 20, 2003 #2


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    HW, so this is going to be a step at a time: 1) what's the ORDER of the reaction --- you've got a rate expression; 2) what else does the rate expression tell you; 3) WHAT is "C"?
  4. Nov 20, 2003 #3
    You're almost there. For the second equation put C on the left side. That should do it.
  5. Nov 24, 2003 #4
    Do what meninger said. C is the intermediate in the reaction, therefore it can't be in the final product at all.
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