Even though lead is toxic, lead compounds were used in ancient times as white pigments in cosmetics. What is the percentage of lead by mass in lead(IV) carbonate, Pb(CO₃)₂?

Question

Quizplus · Accepted Answer

To find the percentage of lead by mass in lead(IV) carbonate, we need to find the molar mass of the compound, which can be calculated by adding the molar masses of each element:

Pb(CO3)2 = (1 x 207.2) + (2 x 60.01) = 327.22 g/mol

Next, we need to find the mass of lead in one mole of lead(IV) carbonate:

Mass of Pb = 1 x 207.2 g/mol = 207.2 g

Finally, we can calculate the percentage of lead by mass:

% Pb = (Mass of Pb / Molar mass of compound) x 100
% Pb = (207.2 / 327.22) x 100 = 63.3%

Therefore, the correct answer is choice C (63.3%).

Even Though Lead Is Toxic, Lead Compounds Were Used in Ancient