Question 5
A 3 grams of an alloy of lead is dissolved in HNO$_3$. Sulfuric acid is added to this solution which precipitates PbSO$_4$. The precipitate is filtered, dried and weighed to constant mass of 1.15g. calculate the mass of lead (Pb) in the ore sample.
(Atomic mass of Pb=207.2, S=32, O=16 g/mole)
a. 1.15 g of Pb, 38.44% Pb
b. 11.5 g Pb, 99.8% Pb
c. 2.47 g Pb, 82.40% Pb