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Carbon is also found in coal, petroleum, and natural gas. Carbon is one of the most important elements on the periodic table (at least from the perspective of organic chemists!).
Hydrocarbons are a class of chemicals that contain only hydrogen and carbon atoms. Some have hydrogen with rings of carbon atoms, called polycyclic aromatic hydrocarbons or PAHs. Hydrocarbons with additives, such as gasoline, also are included.Typical substances include automotive gasoline, benzene, butadiene, fuel oils, jet fuels, and various PAHs.PAHs include naphthylene and over 100 different substances formed during the incomplete burning of coal, oil and gas, garbage, or other organic substances like tobacco or charbroiled meat.ypical substances include automotive gasoline, benzene, butadiene, fuel oils, jet fuels, and various PAHs. PAHs include naphthylene and over 100 different substances formed during the incomplete burning of coal, oil and gas, garbage, or other organic substances like tobacco or charbroiled meat.