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FeS + 2HCl >> FeCl2 + H2S

75 grams FeS (1mole FeS/87.92 grams)(2 mole HCl/1 mole FeS)

= 1.71 moles HCl

2 Molar HCl = 1.71 moles HCl/Liters

= 0.855 Liters HCl, or as asked for;

855 milliliters of hydrochloric acid needed

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Q: How many millimeters of a 2 Molar solution of hydrochloric acid are needed to completely react with 75 grams of iron sulfide?
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