posted by Kate .
The rock in a lead ore deposit contains 84% PbS by mass. How many kilograms of the rock must be processed to obtain 1.0 kg of Pb?
1 kg Pb = ? mols Pb. mols = grams/molar mass
1 mol PbS = 1 mol Pb
kg PbS required = mols PbS x molar mass PbS.
mass PbS/0.84 = mass lead ore deposit that must be processed.
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