MISSED THIS? Watch KCV: Limiting Reactant, Theoretical Yield, and Percent Yield, IWE: Limiting Reactant and Theoretical Yield; Read Section 4.4. You can click on the Review link to access the section in your eText. Iron(II) sulfide reacts with hydrochloric acid according to the reaction FeS(s)+2HCl(aq)FeCl2(aq)+H2S(s) A reaction mixture initially contains 0.222molFeS and 0.678mol 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