# Chemistry

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?

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1. 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.
Check my thinking. Check my work.

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posted by DrBob222

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