Molar Mass of CaCO3 (Calcium Carbonate)

Molar Mass Calculator

What is the molar mass of CaCO₃?

Answer

M(CaCO₃) =

100.086 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Cacalcium	1	40.078	40.078 w ≈ 40.04%	≈ 40.04%
Ccarbon	1	12.011	12.011 w ≈ 12.00%	≈ 12.00%
Ooxygen	3	15.999	47.997 w ≈ 47.96%	≈ 47.96%
Σ = 100.086 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

O 47.96%Ca 40.04%

C 12.00%

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Molar masses of substances nearby

Formula	M, g/mol
CuCl (cuprous chloride)	99.00
Zn(OH)₂ (zinc hydroxide)	99.39
CrO₃ (chromium trioxide)	99.993
CaCO₃ (calcium carbonate)	100.086
KHCO₃ (potassium hydrogen carbonate)	100.114
C₆H₁₂O (cyclohexanol)	100.161
C₇H₁₆ (n-heptane)	100.205

FAQ

What is the molar mass of CaCO3?

M(CaCO₃) = 100.086 g/mol

How to calculate the molar mass of CaCO₃?

Add up the atomic weights of all the atoms in the formula: 40.078 + 12.011 + 3 × 15.999 = 100.086 g/mol.

How many grams are in 2 moles of CaCO₃?

m = n × M = 2 mol × 100.086 g/mol = 200.172 g.

See Also