1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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:
    In[A]-In[A]=-kt
    (In0.00286-In0.0200)/168=-k
    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?

    Thanks.
     
  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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Rates, whats wrong with my working?
  1. My textook=wrong? (Replies: 3)

  2. Check my work (Replies: 1)

Loading...