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A mixture of CdS and CoS is present in a sample the amount of CdS was determined by reacting 8.767 grams of the sample with an excess of hydrochloric acid HCl to release Hydrogen sulfide H2S from each compound; CoS(s) + 2 HCl(aq) = CoCl2 + H2S(g), CdS(s) + 2 HCl(aq) =CdCl2 + H2S(g) If the sample reacted completely and produced 1931 mL of H2S hydrogen sulfide at 29.82 °C and 759.7 mm Hg, determine the mass percentage of Cadmium sulfide in the mixture?

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