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Homework Help: Rates, whats wrong with my working?

  1. Jun 9, 2009 #1
    hey guys ive got a question.

    We examine the conversion of cyclopropane to propene, a first order process. If we begin with 0.0200 M cyclopropane and find that after 168 s the concentration of propene is 0.00286 M, what is the rate constant, k, at this temperature?

    My working:
    therefor k=0.011576 however correct answer is 9.19x10-4

    anyhelp would be good. thanks
  2. jcsd
  3. Jun 9, 2009 #2
    Hello there,

    I get the same answer in mol/(L x s) as you. Could you verify that the correct answer is given in the same units?

  4. Jun 9, 2009 #3
    C. 9.19 x 10-4/s heres the answer out exercise, maybe they just made a mistake, are we using the right formula? thanks for the reply
  5. Jun 11, 2009 #4
    You're welcome.

    Unfortunately, I still have not found a different answer. Is this textbook a recognised, leading one in chemistry? If not, then the answer key may be erroneous.
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