Iron pyrite (fool's gold) is iron (lI) sulfide. What is its formula?

Answer 1

Iron pyrites is #"iron persulfide"#, #FeS_2#, with a formal #Fe(II+)# oxidation state.

The sulfur binds as a #"persulfide"#, i.e. #""^(-)S-S^-#; think #"peroxide"#, #O_2^(2-)#. The formal oxidation state of #S# here is #-I#.

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Answer 2

Caleb Adams

The formula for iron pyrite, also known as fool's gold, is FeS2.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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