How do i achieve this answer. I've re-worked this problem several times, and i keep landing way off.

Question

How many grams of hydrogen sulfide gas will be released, when 10 grams of iron sulfide reacts with hydrochloric acid? Answer 3.88

Answer 1

Assumptions:

1.) There is enough HCl for a complete reaction.

2.) The equilibrium constant for this reaction favors products by an infinite margin and the kinetics are sufficiently fast.

Steps:

1. Write balanced rxn: FeS(s) + 2HCl(aq) ⇌ H₂S(g) + FeCl₂(aq)
2. Stoichiometry
3. (10 g FeS(s))/1∙(mol FeS(s) )/(87.91 g FeS(s) )∙(mol H_2 S(g))/(mol FeS(s) )∙(34.08088 g ¬H_2 S(g) )/(mol H_2 S(g) )=3.9 g H_2 S(g)