Molecular Weight of Calcium Carbonate (CaCO₃)

CaCO₃ (Calcium Carbonate) has one of the most memorable molecular masses in all of chemistry — exactly 100 g/mol.

Question (Click to Flip)

What is the percentage of Calcium in CaCO₃?

Answer

% Ca = (40/100) × 100 = 40%

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Key Facts

CaCO₃ is the main component of limestone, marble, chalk, and seashells. It decomposes on heating: CaCO₃ → CaO + CO₂ (this reaction is tested in board exams).

Step-by-Step Calculation

Formula: CaCO₃

Atomic masses:

Ca (Calcium) = 40 g/mol
C (Carbon) = 12 g/mol
O (Oxygen) = 16 g/mol (× 3 atoms)

Calculation:

Ca: 1 × 40 = 40
C: 1 × 12 = 12
O: 3 × 16 = 48

Total = 40 + 12 + 48 = 100 g/mol

Questions and Answers

What is the percentage of Calcium in CaCO₃?+

% Ca = (40/100) × 100 = **40%**

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