Molar Mass of Na2B4O7·10H2O

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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 Na2B4O7·10H2O?

Answer

M(Na2B4O7·10H2O) ≈
381.36 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — B: 10.81.

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

Na2B4O7·10H2O = Na2B4O7 + 10 H2O → Na 2, B 4, O 17, H 20

Contribution of each element
Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
Nasodium222.99045.980 w ≈ 12.06%
Bboron410.8143.24 w ≈ 11.34%
Ooxygen1715.999271.983 w ≈ 71.32%
Hhydrogen201.008020.1600 w ≈ 5.29%
Σ = 381.363 ≈ 381.36 g/mol w = 100%

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

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

Mass fractions of the elements

Na 12.06%B 11.34%H 5.29%

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See Also

Recalculate with different values ↑

Molar masses of substances nearby

FormulaM, g/mol
Al₂(SO₄)₃ (aluminium sulfate)342.13
C₁₂H₂₂O₁₁ (sucrose)342.297
AgC₁₀H₉N₄SO₂357.14
Na₂B₄O₇·10H₂O381.36
Zn₃(PO₄)₂ (zinc phosphate)386.08
BaI₂ (barium iodide)391.13
Cr₂(SO₄)₃ (chromium(III) sulfate)392.16

FAQ

What is the molar mass of Na2B4O7·10H2O?

M(Na₂B₄O₇·10H₂O) ≈ 381.36 g/mol

Is the water counted in Na₂B₄O₇·10H₂O?

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(Na₂B₄O₇·10H₂O) ≈ 381.36 g/mol, while anhydrous M(Na₂B₄O₇) ≈ 201.21 g/mol.

How many grams are in 2 moles of Na₂B₄O₇·10H₂O?

m = n × M = 2 mol × 381.36 g/mol = 762.72 g.

See Also