A mixture contained zinc sulfide, ZnS, and lead sulfide, PbS. A sample of the mixture weighing 6.12
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ZnS(s) + 2HCl(aq) → ZnCl2(aq) + H2S(g)
PbS(s) + 2HCl(aq) → PbCl2(aq) + H2S(g)
If the sample reacted completely and produced 1.049 L of hydrogen sulfide, H2S, at 23oC and 745 mmHg, what were the percentages of ZnS and PbS in the mixture?
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