Formula: H2O CAS No.: 7732-18-5 pH: (H2O, 20°C) neutral Molar Mass: 18.02 g/mol Boiling Point: 100°C (1013 hPa) Vapor Pressure: 23 hPa (20°C) Density: 1.00 g/cm3 (20°C) Hill Formula: H2O