composition of solid mixture from amount of gas evolved chem question

1. A sample contained a mixture of CoS and CdS. The amount of CoS was determined by reacting 7.029 g of the sample with an excess of HCl to release H2S from each compound;


CoS(s) + 2 HCl(aq) → CoCl
2 + H
2S(g)

CdS(s) + 2 HCl(aq) → CdCl
2 + H
2S(g)

If the sample reacted completely and produced 1453 mL of hydrogen sulfide at 19.89 °C and 720.5 mm Hg, what was the mass percentage of CoS in the mixture?

please include any work

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