chemistry a-level spec confusion PLS HELP

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wyann
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'Combustion of hydrocarbons containing sulfur leads to sulfur dioxide that causes air pollution'.

This sentence from the spec is confusing me bc hydrocarbons don't contain sulfer but only carbon and hydrogen. Please tell me what this sentence from the spec means?
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atlanticblue26
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(Original post by wyann)
'Combustion of hydrocarbons containing sulfur leads to sulfur dioxide that causes air pollution'.

This sentence from the spec is confusing me bc hydrocarbons don't contain sulfer but only carbon and hydrogen. Please tell me what this sentence from the spec means?
Things like coal can be contaminated with sulfur, so when the fuel (eg. coal) is burnt, the main components (ie. hydrocarbons and carbon) combust but the sulfur also combusts. When the sulfur is oxidised, it forms sulfur dioxide, which is a pollutant in itself but one that can also lead to acid rain.
Hope that helps but feel free to drop another message if you have another question (just finished A-Level chemistry so hopefully I still remember even the boring stuff!).
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