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Homework Help: Thermodynamics - Calculating K of reaction

  1. May 1, 2013 #1
    1. The problem statement, all variables and given/known data

    Establish K at 298K for the reaction:

    2N2O4 (g) + O2 (g) → 2N2O5 (g)

    2. Relevant equations

    ΔG° = -RTlnK

    3. The attempt at a solution

    I've established that ΔG° = 34.4 kJ/mol (Correct) but for some reason when I solve for:

    K = eΔG°/-RT

    K = e34.5/(-(8.314)(298)) = .98495

    I get the wrong answer.
  2. jcsd
  3. May 1, 2013 #2
    Ah, silly me... The units for my gas constant are in Joules not kJoules.

    Got it.
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