Molar Mass of K2CO3 (Potassium Carbonate)

Molar Mass Calculator

What is the molar mass of K₂CO₃?

Answer

M(K₂CO₃) =

138.204 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
Kpotassium	2	39.098	78.196 w ≈ 56.58%	≈ 56.58%
Ccarbon	1	12.011	12.011 w ≈ 8.69%	≈ 8.69%
Ooxygen	3	15.999	47.997 w ≈ 34.73%	≈ 34.73%
Σ = 138.204 g/mol w = 100%				100%

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

Mass fractions of the elements

K 56.58%

O 34.73%C 8.69%

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Molar masses of substances nearby

Formula	M, g/mol
PCl₃ (phosphorus trichloride)	137.32
Ba (barium)	137.33
C₇H₆O₃ (salicylic acid)	138.122
K₂CO₃ (potassium carbonate)	138.204
La (lanthanum)	138.91
Ce (cerium)	140.12
C₆H₁₂N₄ (methenamine)	140.190

FAQ

What is the molar mass of K2CO3?

M(K₂CO₃) = 138.204 g/mol

How to calculate the molar mass of K₂CO₃?

Add up the atomic weights of all the atoms in the formula: 2 × 39.098 + 12.011 + 3 × 15.999 = 138.204 g/mol.

How many grams are in 2 moles of K₂CO₃?

m = n × M = 2 mol × 138.204 g/mol = 276.408 g.

See Also