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QUESTION
What is the formula for iron (III) sulfide?
The molecule formula is ##Fe_2S_3##
The molecule iron (III) sulfide is an ionic molecule between the metal Iron and the non-metal sulfur.
In an ionic molecule the formula is determined by balancing the charges on the ions.
For this case the roman numeral (III) tells us the iron has a charge of ##+3## or ##Fe^(+3)##
The the element sulfur has a charge of ##-2## or ##S^(-2)##
To balance these ion charges it takes two ##+3## iron ions to balance three ##-2## sulfide ions.
The molecule formula is ##Fe_2S_3##
