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Combustion of Hydrocarbons - Chemistry.

Complete Combustion of Natural Gas - Methane.

Complete combustion happens when
the hydrocarbon burns in an excess of air.
An excess of air means that there is more than enough oxygen
to cause all of the carbon to turn into carbon dioxide.
The methane gas burns with a clear blue flame.

methane + oxygen    carbon dioxide + water + energy
CH_4(g)  +  2O_2(g)           CO_2(g)    +    2H₂O_(l)            

The reaction is exothermic (gives out heat).

You must know how to test for the products.
See the test for carbon dioxide and the test for water vapour.

Complete Combustion of Ethane.

ethane + oxygen    carbon dioxide + water + energy
2C₂H_6(g)  + 7O_2(g)         4CO_2(g)   +   6H₂O_(l)            

The reaction is exothermic (gives out heat).
The products are the same (carbon dioxide and water).
More oxygen is required for the complete combustion of ethane
(compared to methane above)
giving four times the quantity of carbon dioxide
and three times the quantity of water.

Combustion of hydrocarbons, whether complete or incomplete,
has environmental and health concerns - see environmental issues.

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Copyright © 2008 Dr. Colin France. All Rights Reserved.