Molar Mass of Na2SO4 (Sodium Sulfate): Step by Step

What is the molar mass of Na₂SO₄?

Answer

M(Na₂SO₄) ≈

142.04 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.

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 ≈ 32.37%	≈ 32.37%
Ssulfur	1	32.06	32.06 w ≈ 22.57%	≈ 22.57%
Ooxygen	4	15.999	63.996 w ≈ 45.06%	≈ 45.06%
Σ = 142.036 ≈ 142.04 g/mol w = 100%				100%

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Formula	M, g/mol
AsH₃O₄ (arsenic acid)	141.942
P₂O₅ (phosphorus pentoxide)	141.943
Na₂HPO₄ (dibasic sodium phosphate)	141.958
Na₂SO₄ (sodium sulfate)	142.04
C₁₀H₂₂ (decane)	142.286
Ca(ClO)₂ (calcium hypochlorite)	142.98
Cu₂O (copper(I) oxide)	143.091