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Homework Help: Conversion of cyclopropane to propene

  1. Jun 17, 2009 #1
    1. The problem statement, all variables and given/known data


    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?



    i used the forumula ln[A]/=-kt
    =(ln 0.00286/0.02)/168=-k
    therefore k=0.0116
    however answer is 9.19 x 10-4/s

    anyhelp would be good.
    thanks
     
  2. jcsd
  3. Jun 18, 2009 #2

    tiny-tim

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    Hi geffman1! :smile:

    Aren't you using the formula for 0.0200 M cyclopropane and 0.00286 M cyclopropane? :redface:
     
  4. Jun 18, 2009 #3
    Re: kinectics

    hey, umm yep??? im confused
     
  5. Jun 19, 2009 #4

    tiny-tim

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    Perhaps I've misunderstood your equation, but the question gives you the concentration of different compounds, and I think you've used an equation that asumes they're the same compound.
     
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