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Coal is normally burned to produce heat. This is done by burning the coal with oxygen from the atmosphere. The process unites carbon and oxygen to produce carbon dioxide and the formation of the chemical bonds in this process releases energy as heat.

Burning one ton of coal creates about 3 tons of carbon dioxide. The additional mass comes from the oxygen taken from the atmosphere.

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When coal burns, it produces heat. This can be converted to other forms of energy.


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In an unburned lump of coal, the energy is in potential form. When coal is burned, its chemical energy is converted into heat and other forms of energy.


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