The standard enthalpy change for the reaction is the difference between standard enthalpies of formation for products multiplied by their stoichiometric coefficients and standard enthalpies of formation for reactants multiplied by their stoichiometric coefficients
For the reaction above ∆rH=∆fH(COCl2)-∆fH(CO)-∆fH(Cl2)
Thus, ∆fH(CO)=-∆rH+∆fH(COCl2)+∆fH(Cl2)
∆fH(Cl2)=0 kJ/mol
∆fH(COCl2)=-218.0 kJ/mol
∆fH(CO)=-(-104.6)+(-218.0)+0=-113.4kJ/mol
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