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Homework Help: First-Order Kinetics and Activation energy

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data
    I already have an answer I'm just not sure if it's correct. This is done mostly graphically I just need to known if anyone else thinks it makes sense.

    Given this data: what is the rate constant, K, for each reaction, half life of each reaction and activation of the reaction?

    Time, Rxn@45C, @ 35C, @25C
    0, 7.14E-5, 7.46E-5, 7.46E-5
    5, 4.11E-5, 6.63E-5, 7.33E-5
    10, 2.35E-5, 5.94E-5, 7.25E-5
    15, 1.34E-5, 5.21E-5, 7.16E-5
    20, 7.66E-6, 4.62E-5, 6.94E-5
    25, 4.63E-6, 4.04E-5, 6.80E-5
    30, 3.11E-6, 3.56E-5, 6.67E-5
    25, 2.36E-6, 3.12E-5, 6.50E-5
    40, 2.03E-6, 2.76E-5, 6.37E-5
    45, 0 , 2.38E-5, 6.28E-5
    50, “ “, 2.10E-5, 6.13E-5
    55, “ “, 1.83E-5, 5.96E-5
    60, “ “, 1.62E-5, 5.81E-5

    K for reaction, 2.68mol-1, .570mol-1, .0675mol-1
    Half-Life of Reaction, .259, 1.22, 10.3
    Activation Energy of Reaction 145kJ/mol

    I also don't know if half-life is supposed to be in minutes or hours or what?

    2. Relevant equations

    HL = ln(2)/K
    ln(k) = -Ea/RT + ln(a)

    3. The attempt at a solution
  2. jcsd
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