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Há 16 horas · Tetraethyllead (commonly styled tetraethyl lead ), abbreviated TEL, is an organolead compound with the formula Pb ( C 2 H 5) 4. It was widely used as a fuel additive for much of the 20th century, first being mixed with gasoline beginning in the 1920s as a patented octane rating booster that allowed engine compression to be raised substantially.
- C₈H₂₀Pb
- 323.4 g·mol−1
- −136 °C (−213 °F; 137 K)
- 200 parts per billion (ppb) (20 °C)
Há 16 horas · This is a list of heads of state and government who died in office. In general, hereditary office holders (kings, queens, emperors, emirs, and the like) and holders of offices where the normal term limit is life (popes, presidents for life, etc.) are excluded because, until recently, their death in office was the norm.
