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What is the chemical composition of natural gas?

Natural gas consists of the following elements:

Methane CH4 90.0%

Ethane C2H6 5%

Propane C3H8 1%

Butane C4H10 0.2%

Oxygen O2 0.0%

Helium He 0.0%

Nitrogen N2 2.2%

Carbon dioxide CO2 1.4%

Carbon monoxide CO 0.0%