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Enthalpy Question

Submitted by AversiveCow on Tue, 11/07/2017 - 22:37

2O3->3O2 deltaH=-285 kJ/molrxn 
The bond enthalpy of the oxygen-oxygen bond in O2 is 498 kJ/mol. Based on the enthalpy of the reaction represented above, what is the average bond enthalpy, in kJ/mol, of an oxygen-oxygen bond in O3?