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The bulk of a typical gasoline consists of hydrocarbons with between 4 and 12 carbon atoms per molecule (commonly referred to as C4-C12). It is a mixture of paraffins (alkanes), cycloalkanes (naphthenes), and olefins (alkenes), where the usage of the terms paraffin and olefin is particular to the oil industry.
Literally 'rock oil,' it is a general term for crude oil and natural gas. Primary source of automotive fuels and lubricant oils, petroleum is a complex mixture of hydrocarbons and paraffins in some areas, and aromatics and cyclo-paraffins in other areas.rude petroleum (crude oil) contains about 80 percent carbon compounds, 11 percent hydrogen, and 1 to 2 percent of nitrogen, oxygen, and sulfur. In most oil fields, oil and natural gas occur together, gas being the top layer on crude oil under which may lie water.