Question: A 0.3708 gram sample of ore contains Pb 3 O 4 and inert material. The lead is precipitated as PbSO 4 and weighs 0.3699 grams.

A 0.3708 gram sample of ore contains Pb 3 O 4 and inert material. The lead is precipitated as PbSO 4 and weighs 0.3699 grams. What is the % w/w Pb composition of the ore sample. Express your answer as % of Pb 3 O 4 in the original sample.
Assumptions: the Pb 3 O 4 reacts completely to form precipitate when H 2 SO 4 is applied to it.
You will need to write a chemical equation that is balanced in terms of the Pb atoms to determine the stoichiometry of the precipitate. ( you can safely ignore the balancing of the sulfur and oxygen )

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