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Bond Enthalphy of Oxygen Gas

 
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Dec2-12, 11:56 AM   #1
 

Bond Enthalphy of Oxygen Gas

why is average bond enthalpy of O2 is 495....But the formation enthalpy of O2 is 0 ??
Why are they different??
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Dec3-12, 12:36 AM   #2
 
See the definition of formation of Enthalpy.
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