[{"from": "human", "value": "Could you provide a description of this molecule? [C]"}, {"from": "gpt", "value": "The molecule is a naturally occurring gas consisting of a hydrocarbon mixture that is primarily methane, but may include varying amounts of other higher alkanes and a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium. Natural gas is a fossil fuel used as a source of energy for heating, cooking, electricity generation, and transportation. It is also used in the manufacture of plastics and other commercially important organic chemicals."}]