How do you balance the equation for FeS?
Since it is an ionic compound, the overall charge should be zero. Iron (Fe) has possible different charges which are +2, and +3 however sulfide always has a charge of -2. Therefore, FeS is already balanced. When you write it, instead of writing "Iron Sulfide", you would write "Iron (II) Sulfide" this is because Iron has different charges and you must specify when you write it down.
Please don't give me anything like No one will ever know for sure How do you balance the chemical equation FeS plus HCl equals FeCl2 plus H2S?
The answer is FeS + 2 HCl = FeCl2 + H2S. This can be found by noting that at least two molecules of HCl will be needed for each mole of FeS. Trying the simplest possible answer results in a left side of FeS + 2 HCl, which contains one atom each of sulfur and iron and two atoms each of hydrogen and chloride. The stated products, with no multiples, also contains one atom each…