Question

Calculate the % of each element in calcium carbonate. (Atomic mass: C-12, O-16, Ca -40)

Answer 1

Calcium carbonate: CaCO₃

Molar mass of CaCO₃ = 40 + 12 + (16 × 3) = 100 g

% of Calcium = `40/100×100` = 40%

% of Carbon = `12/100×100` = 12%

% of Oxygen = `48/100×100` = 48%.