Practice question
Question
In 5FeS + 9O₂ → Fe₂O₃ + 2Fe₂(SO₄)3, what is the total change in oxidation number of sulfur per mole of FeS?
Explanation
S (-2 in 5FeS) becomes +6 in 2Fe₂(SO₄)3 (6 S atoms). Total change = 6 × (+6 - (-2)) = 48; per FeS = 48/5 = 9.6, but reaction context gives +8.
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