Question

1.167-g sample of iron powder reacted with 0.680 g of sulfur powder to give iton oduct. Calculate the empirical formula of the iron sulfide.

Answer 1

Given that the 1.167 grams of Iron reacts with 0.680 grams 0f sulfur.

Number of moles of Iron = weight of the Iron/ molecular weight of the iron = 1.167/55.845 = 0.02 moles

Number of moles of Sulfur = weight of the Sulfur/ molecular weight of the Sulfur = 0.680/32= 0.02 moles.

i.e 0.02 moles of iron reacts with 0.02 moles of sulfur.

The empirical formula of the iron sulfide FeS.