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Toxics: Benzene: Physical & Chemical Data Disclaimer Benzene: Physical & Chemical Data Chemical Formula: C6H6 CAS Number: 71-43-2 Molecular Weight: 78.11 Color: Clear Physical State: Liquid Melting Point: 5.5 degrees C Boiling Point: 80.1 degrees C Density at 15 degrees C: 0.8787 g/cm3 Odor: Aromatic Solubility in Water at 25 degrees C: 0.188% Octanol-water partitioning coefficient: 2.13 Soil absorption coefficient: 1.8-1.9 Vapor Pressure at 20 degrees C: 75 mm Hg Henry's law constant at 25 degrees C: 5.5x10-3 atm-m3/mol Autoignition temperature: 498 degrees C Closed cup Flashpoint: -11 degrees C Source: Toxicological Profile for Benzene. 2005 Draft for Public Comment. Agency for Toxic Substances & Disease Registry. See Also: Main Benzene Page 1995 Version Links