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