ABSTRACT
H2C CH2 CASRN: 591-93-5; molecular formula: C5H8; FW: 68.12 Physical state: Liquid or gas Melting point (°C): -148.3 (Weast, 1986) Boiling point (°C): 26 (Weast, 1986) Density (g/cm3): 0.66076 at 20 °C, 0.65571 at 25 °C (Dreisbach, 1959) Diffusivity in water (x 10-5 cm2/sec): 0.87 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: >14 (Schwarzenbach et al., 1993) Flash point (°C): 4 (Acros Organics, 2002) Entropy of fusion (cal/mol⋅K): 11.62 (Messerly et al., 1970) 11.81 (Parks et al., 1936a) Heat of fusion (kcal/mol): 1.452 (Messerly et al., 1970) 1.468 (Parks et al., 1936a) Henry’s law constant (atm⋅m3/mol): 0.120 at 25 °C (Hine and Mookerjee, 1975) Ionization potential (eV): 9.58 (Collin and Lossing, 1959) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aliphatic hydrocarbons are lacking in the documented literature Octanol/water partition coefficient, log Kow: 2.48 (Hansch and Leo, 1979) Solubility in organics: Soluble in acetone, alcohol, benzene, and ether (Weast, 1986)
558 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1966) Vapor density: 2.78 g/L at 25 °C, 2.35 (air = 1) Vapor pressure (mmHg): 734.6 at 25 °C (Wilhoit and Zwolinski, 1971) Uses: Chemical research; organic synthesis.
