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Problem: Iron(II) sulfide reacts with hydrochloric acid according to the reaction:FeS (s) + 2HCl (aq) → FeCl2 (s) + H2S (g) A reaction mixture initially contains 0.223 mol FeS and 0.665 mol HCl. Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant remains?Express your answer to three significant figures.

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Problem Details

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

FeS (s) + 2HCl (aq) → FeCl2 (s) + H2S (g) 

A reaction mixture initially contains 0.223 mol FeS and 0.665 mol HCl. 

Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant remains?

Express your answer to three significant figures.


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