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Quasi-chemical model in thermodynamics

  1. Sep 30, 2006 #1
    For the quasi-chemical model in thermodynamics,
    there's a part where there's an equation,
    E= E(AB) - 0.5[E(AA)+E(BB)]
    where E(AB)= bonding of AB
    E(AA)= bonding of AA
    E(BB)= bonding of BB

    but why do you need to multiply 0.5 in the equation?
  2. jcsd
  3. Jan 31, 2009 #2
    E is the difference between AB bond energy and the average of the AA & BB bond energies taken into account.
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