Molar Mass of Na2SO4·10H2O (Sodium Sulfate Decahydrate)

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Chemical formula Write symbols with a capital letter: CoCl2 is cobalt chloride, COCl2 is phosgene. A hydrate takes a dot: CuSO4·5H2O or CuSO4.5H2O

What is the molar mass of Na2SO4·10H2O?

Answer

M(Na2SO4·10H2O) ≈
322.19 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — S: 32.06.

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

Na2SO4·10H2O = Na2SO4 + 10 H2O → Na 2, S 1, O 14, H 20

Contribution of each element
Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
Nasodium222.99045.980 w ≈ 14.27%
Ssulfur132.0632.06 w ≈ 9.95%
Ooxygen1415.999223.986 w ≈ 69.52%
Hhydrogen201.008020.1600 w ≈ 6.26%
Σ = 322.186 ≈ 322.19 g/mol w = 100%

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

Mass fractions of the elements

Na 14.27%S 9.95%H 6.26%

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Recalculate with different values ↑

Molar masses of substances nearby

FormulaM, g/mol
C₂₀H₁₄O₄ (phenolphthalein)318.328
ZnI₂ (zinc iodide)319.18
C₁₆H₁₈ClN₃S (methylene blue)319.85
Na₂SO₄·10H₂O (sodium sulfate decahydrate)322.19
PbCrO₄ (lead(II) chromate)323.2
Hg(NO₃)₂ (mercuric nitrate)324.60
(CH₃COO)₂Pb (lead(II) acetate)325.3

FAQ

What is the molar mass of Na2SO4·10H2O?

M(Na₂SO₄·10H₂O) ≈ 322.19 g/mol

Is the water counted in Na₂SO₄·10H₂O?

Yes: the water of crystallization is part of the formula and of the molar mass. 10 H₂O add 10 × 18.015 = 180.150 g/mol; M(Na₂SO₄·10H₂O) ≈ 322.19 g/mol, while anhydrous M(Na₂SO₄) ≈ 142.04 g/mol.

How many grams are in 2 moles of Na₂SO₄·10H₂O?

m = n × M = 2 mol × 322.19 g/mol = 644.38 g.

See Also