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Rating Newest Oldest. Best Answer: Fe(OH)3. The III in iron III hydroxide means that the iron has an oxidation number of +3. Since hydroxide (OH) always has a -1 oxidation number, three are needed in order to make a neutral compound. This Site Might Help You.
Pyrrhotite, which is chemically called. iron sulfide, has the ideal formula FeS (Fe = iron, S = sulfur). This formula means that in. ANY AMOUNT of pyrrhotite, the ratio of iron to sulfur will be 1:1. molecules of iron sulfide). physical properties from the elemental iron and sulfur out of which it was formed. of used chemicals should follow the protocol developed by the school.