Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Chemistry Problem - Reaction Rates

  1. Jan 17, 2005 #1
    I know this isn't a physics problem, but it's driving me crazy because I can't figure it out.

    >> The rate of a particular reaction doubles (2.0 X) when the temperature is increased from 25 C to 35 C. By what factor will the rate increase over the temperature interval of 118 C to 128 C? <<

    I'm thinking I have to use the Arrhenius equation that says:
    e^(k2/k1) = e^Ea/R(1/t1-1/t2)

    But I'm not given all of the information I need to solve it, am I? I'm very confused... I read over the notes handed out in class and the section in the book that covers this topic and I still can't figure it out. :confused:
  2. jcsd
  3. Jan 17, 2005 #2
    this is not solvable unless you make some unrealistic assumtion..
  4. Jan 17, 2005 #3


    User Avatar
    Homework Helper

    Solve for Ea. You've got everything... k2/k1=2. you've got t1=25C and t2=35C (convert to K).

    Then plug in Ea, t1=118C and t2=128C to solve for k2/k1 for the second situation.
  5. Jan 17, 2005 #4
    Thanks I think I understand it now :smile: I was getting stuck with using k2/k1 being equal to 2... but since the rate is doubling, the k2 would have to be 2x larger. Thanks :D
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook