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The fact that it oxidizes in air is a chemical property of methane.
CH4 is the formula for methane
methane gas used in mines is called a firedamp.
This is very basic math. Carbon = 6/8*Methane (6/8)*4=3 3 g
methane and oxygen react together (combustion) to give carbon dioxide + water.
The reactants are methane and oxygen which react to form the products water and carbon dioxide.