Propanone has the molecular formula C3H6O.The enthalpy change of combustion of hydrogen is –286kJmol–1;The enthalpy change of combustion of carbon is –394kJ mol–1The enthalpy change of combustion of carbon is –394kJ mol–1The enthalpy change of combustion of propanone is –1786kJ mol–1 Following this information, what is the enthalpy change of formation of propanone?