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Entropy of Formation Calculation

  1. Mar 9, 2010 #1
    1. The problem statement, all variables and given/known data

    Hi everyone. So I've already worked out delta H to be 57.88 kJ, T is 298K and I've been given a value of 29.94 for lnK0. Now I need to calculate delta S but think my numbers are too small to be doing it right...?

    2. Relevant equations

    1.) delta G0 = -RTlnK0
    2.) delta G0 = delta H0 - T delta S0

    3. The attempt at a solution

    From equation 1 I've calculated delta G0 to be:

    delta G 0 = -8.314 x 298 x 29.94

    delta G0 = - 74176.03 J
    = -74.18 kJ

    I've then rearranged equation 2 to get:

    - delta S0 = delta G0 - delta H0/ -T

    = -74.18 - - 57.88/-298
    = 0.054

    Surely this number is too small though? Am I going wrong somewhere?
     
  2. jcsd
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