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Bond Enthalphy of Oxygen Gas

  1. Dec 2, 2012 #1
    why is average bond enthalpy of O2 is 495....But the formation enthalpy of O2 is 0 ??
    Why are they different??
  2. jcsd
  3. Dec 3, 2012 #2


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    Gold Member

    See the definition of formation of Enthalpy.
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