What is the molecular formula of the unidentified compound? An unidentified covalent molecular compound contains only hydrogen, carbon, and oxygen. When 4.40 mg of this compound is burned, 1.04 mg of H2O and 8.91 mg of CO2 are produced. The freezing point of camphor is lowered by 18.4°C when 2.694 g of the compound is dissolved in 19.25 g of camphor (Kf = 40.0°C kg/mol).