The most important ore of lead is galena that is principally \mathrm{PbS}(s). The ore may be analyz…

The most important ore of lead is galena that is principally \mathrm{PbS}(s). The ore may be analyzed for its lead content by treating the ore with nitric acid and then precipitating the \mathrm{Pb}^{2+}(a q) with potassium chromate, \mathrm{K}_{2} \mathrm{CrO}_{4}(a q), to give \mathrm{PbCrO}_{4}(s). A 6.053 -gram sample of galena yielded 7.248 grams of \mathrm{PbCrO}_{4}(s) precipitate when treated in the above manner. Calculate the mass percentage of \mathrm{PbS}(s) in the ore.

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