Iron(II) sulfide reacts with hydrochloric acid according to the
FeS(s) + 2 HCl(aq)¡FeCl2(s) + H2S(g)
A reaction mixture initially contains 0.223 mol FeS and
0.652 mol HCl. Once the reaction has occurred as completely as
possible, what amount (in moles) of the excess reactant
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