Chemistry Help!?

Given that a chlorine-oxygen bond in ClO2(g) has an enthalpy of 243kJ/mol , an oxygen-oxygen bond has an enthalpy of 498kJ/mol , and the standard enthalpy of formation of ClO2(g) is ΔH∘f=102.5kJ/mol, use Hess's law to calculate the value for the enthalpy of formation per mole of ClO(g).
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