Question

Iron(II) sulfide reacts with hydrochloric acid according to the reaction

FeS(s)+2HCl(aq)→FeCl2(aq)+H2S(s)

A reaction mixture initially contains 0.228 mol FeS and 0.664 mol HCl.

Once the reaction has reached completion, what amount (in moles) of the excess reactant is left?
Express the answer in moles to three significant figures.
 
 

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