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Homework Help: Finding Activation Energy From Arrhenius Plot

  1. Apr 10, 2008 #1
    1. The problem statement, all variables and given/known data

    For a lab, I need to find the activation energy of an experiment from plotting the Arrhenius plot. I have the half-life time of the reaction at various temperatures.

    2. Relevant equations

    -Temperature (K)
    318
    322
    327
    331
    338

    -ln k
    -6.17
    -5.89
    -5.65
    -5.33
    -5.01

    -1/T
    3.145 x 10^-3
    3.106 x 10^-3
    3.058 x 10^-3
    3.021 x 10^-3
    2.956 x 10^-3

    3. The attempt at a solution

    So far I've plotted ln k vs 1/T.
     
  2. jcsd
  3. Apr 10, 2008 #2
    Ok forget that. why would the concentration of H2O be ignored in a rate law reaction?
     
    Last edited: Apr 10, 2008
  4. Apr 11, 2008 #3

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    It would be ignored if the rate of the reaction was independent of H2O concentration.
     
  5. Apr 11, 2008 #4
    Because it is a (l) and we only consider the concentrations of (aq) solutions.
     
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