What is the formula for iron (III) sulfide?

1 Answer
BRIAN M.
Jul 9, 2016

The molecule formula is #Fe_2S_3#

Explanation:

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#

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