CAS No.: 7647-18-9 UN No.: UN1730 Solubility: (20°C) (rigorous decomposition) Melting Point: 3 - 4°C Molar Mass: 299.01 g/mol Boiling Point: 140°C Vapor Pressure: 1.1 hPa (20°C) Density: 2.35 g/cm3 (20°C)