User:Milton Beychok/Sandbox

Properties Property Value Common name tetra-ethyl lead Other names tetraethyl lead, lead tetraethyl, tetraethyl plumbane IUPAC name CAS number 78-00-2 Molecular formula (CH3CH2)4Pb Molecular mass 323.4 g/mol Density 1.653 g/ml for liquid at 20 °C, 1 atm Boiling point 455.7 K (182.6 °C) at 1 atm Melting point 142.94 K (-130.2 °C) Specific heat, cp 0.956 J/(g·K) for liquid at 20 °C Heat of vaporization 175.0 J/g for liquid at 182.6 °C Heat of fusion 27.2 J/g for solid at -130.2 °C Viscosity Refractive index

Tetra-ethyl lead (TEL) is a viscous liquid with the chemical formula (CH₃CH₂)₄Pb. Once widely used (circa 1925 to 1990) to increase the octane rating of gasoline (petrol), TEL usage in gasoline has been largely phased out by most nationsprimarily because of the toxicity of the lead emissions from spark-ignited internal combustion engines burning gasoline containing TEL. Another reason for discontinuing TEL usage was that it degraded the efficiency of the catalytic converters installed in automotive vehicles to reduce their emissions of air pollutants.