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Hydrogen sulfide gas is used to precipitate the ferric ion from solution as the sulfide salt....

Hydrogen sulfide gas is used to precipitate the ferric ion from solution as the sulfide salt. In a particular reaction, 4.000 L of H2S gas at STP is bubbled into 85.00 mL of a 1.400 M Solution of ferric chloride. What is the mass of ferric sulfide formed? Determine the moles of the reagent not completely consumed.

2Fe^3+(aq) + 3H2S(g) --> Fe2S3(s) + 6H^+(aq) (balanced)

MM of Fe2S3 is 207.88 g/mol.

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