Carbon and carbon monoxide burn in oxygen to form carbon dioxide according to the following reactions \[C+{{O}_{2}}\to C{{O}_{2}};\,\Delta H=-394\,kJ\,mo{{l}^{-1}}\] \[2CO+{{O}_{2}}\to 2C{{O}_{2}};\,\Delta H=-569\,kJ\,mo{{l}^{-1}}\] The heat of formation of \[1\,mol\]of carbon monoxide is thus [MP PET 1995]

• A.                 \[-219.0\,kJ\,mo{{l}^{-1}}\]        
• B.                 \[-109.5\,kJ\,mo{{l}^{-1}}\]
• C.                 \[-175.0\,kJ\,mo{{l}^{-1}}\]        
• D.                 \[-87.5\,kJ\,mo{{l}^{-1}}\]