Chemical formula is a formula of a compound showing the symbols of elements present in the compound. Chemical formula also shows the number of atoms of each element present in a compound.HCl is the chemical formula of hydrochloric acid. From this formula we can tell that hydrochloric acid is made up of hydrogen and chlorine elements.The formula also shows that HCl contains 1 hydrogen atom and 1 chlorine atom.
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The answer is fossil fuels.
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