Question: The following equilibrium was studied by analyzing the equilibrium mixture for the amount of H2S produced. A vessel whose volume was 2.50 L was filled

The following equilibrium was studied by analyzing the equilibrium mixture for the amount of H2S produced.

A vessel whose volume was 2.50 L was filled with 0.0100 mol of antimony(III) sulfide, Sb2S3, and 0.0100 mol H2. After the mixture came to equilibrium in the closed vessel at 440oC, the gaseous mixture was removed, and the hydrogen sulfide was dissolved in water. Sufficient lead(II) ion was added to react completely with the H2S to precipitate lead(II) sulfide, PbS. If 1.029 g PbS was obtained, what is the value of Kc at 440oC?

sh,S3(s) + 3H2(g) 2Sbs) + 3H-S(g)

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