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Using an Arrhenius plot

  1. Mar 25, 2012 #1
    Heres the question:
    http://img215.imageshack.us/img215/1185/screenshot5xq.png [Broken]
    Kinetics is probably my weakest area in chemistry so I'm struggling. To find the shelf life, I need to use the Arrhenius equation but I don't know the activation energy Ea or the A constant. So I converted 2 those percentages into rates and got:
    At 40C, rate = 0.082 %/month
    At 60C, rate = 0.39 %/month

    I know that if I plot 1/T vs. lnk, I get an Arrhenius plot and then I can find Ea from the slope and A from the y-intercept but I don't have k. Can I just use the rates that I have instead of k?
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Mar 25, 2012 #2

    Borek

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    Staff: Mentor

    You have two data points and two unknowns, that means you should be able to find both solving system of two equations.
     
  4. Mar 25, 2012 #3
    Can you elaborate on that a bit. Do you mean use simultaenous equations?
     
  5. Mar 25, 2012 #4

    Borek

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    Staff: Mentor

    Yes.
     
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