why is sulfur dioxide produced when coal is burned?
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Burning coal (or any fossil fuel) is essentially extracting the energy stored in the coal by oxidation. It turns out that the sulfur is also oxidized in burning coal, forming sulfur dioxide (SO2).
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Here's your answer :
Coal contains many impurities and sulfur is one of them. When coal is burned the sulfur combines with oxygen and the sulfur oxides are released to the atmosphere. Sulfur dioxide (SO2) becomes sulfur trioxide (SO3) when reacting with oxygen in the air.
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