Molar Mass of Na2CO3·10H2O (Sodium Carbonate Decahydrate)

What is the molar mass of Na₂CO₃·10H₂O?

Answer

M(Na₂CO₃·10H₂O) =

286.138 g/mol

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

10 H₂O — water of crystallization, part of the molar mass: 10 × 18.015 = 180.150.

Na₂CO₃·10H₂O = Na₂CO₃ + 10 H₂O → Na 2, C 1, O 13, H 20

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Nasodium	2	22.990	45.980 w ≈ 16.07%	≈ 16.07%
Ccarbon	1	12.011	12.011 w ≈ 4.20%	≈ 4.20%
Ooxygen	13	15.999	207.987 w ≈ 72.69%	≈ 72.69%
Hhydrogen	20	1.0080	20.1600 w ≈ 7.05%	≈ 7.05%
Σ = 286.138 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.

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Formula	M, g/mol
P₄O₁₀ (phosphorus pentoxide)	283.886
FeH₈N₂O₈S₂ (ferrous ammonium sulfate)	284.04
C₁₈H₃₆O₂ (stearic acid)	284.484
Na₂CO₃·10H₂O (sodium carbonate decahydrate)	286.138
ZnSO₄·7H₂O (zinc sulfate heptahydrate)	287.54
CaWO₄ (calcium tungstate)	287.91
C₁₂H₂₅NaO₄S (sodium lauryl sulfate)	288.38