We’re being asked to determine the standard enthalpy change of formation (ΔH˚f) for CO(g). Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
We’re given the ΔH˚rxn for the combustion of 2 moles of CO(g). The chemical equation for that reaction is:
2 CO(g) + O2(g) → 2CO2(g)
This equation is already balanced.
The ΔHf° for CO2 (g) is -393 kJ/mole and ΔHrxn for the reaction
2CO(g) + O2(g) → 2CO2(g) is -560 kJ. The ΔHf° for CO(g) is (in kJ/mole):
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