. . "A hydrocarbon is any chemical molecule that consists of ONLY hydrogen and carbon. The simplest example is the gas methane, which has 1 carbon atom and four hydrogen atoms."@en . "What is hydrocarbon"@en . "A hydrocarbon is any chemical molecule that consists of ONLY hydrogen and carbon. The simplest example is the gas methane, which has 1 carbon atom and four hydrogen atoms."@en . .