Molar Mass of MgSO4 (Magnesium Sulfate)

Molar Mass Calculator

What is the molar mass of MgSO₄?

Answer

M(MgSO₄) ≈

120.36 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
Mgmagnesium	1	24.305	24.305 w ≈ 20.19%	≈ 20.19%
Ssulfur	1	32.06	32.06 w ≈ 26.64%	≈ 26.64%
Ooxygen	4	15.999	63.996 w ≈ 53.17%	≈ 53.17%
Σ = 120.361 ≈ 120.36 g/mol w = 100%				100%

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

Mass fractions of the elements

O 53.17%

S 26.64%Mg 20.19%

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Molar masses of substances nearby

Formula	M, g/mol
NaHSO₄ (sodium bisulfate)	120.05
C₄H₈O₄	120.104
C₈H₈O (acetophenone)	120.151
MgSO₄ (magnesium sulfate)	120.36
C₄H₁₁NO₃ (tromethamine)	121.136
Sr(OH)₂ (strontium hydroxide)	121.63
Sb (antimony)	121.76

FAQ

What is the molar mass of MgSO4?

M(MgSO₄) ≈ 120.36 g/mol

How to calculate the molar mass of MgSO₄?

Add up the atomic weights of all the atoms in the formula: 24.305 + 32.06 + 4 × 15.999 = 120.361 ≈ 120.36 g/mol.

How many grams are in 2 moles of MgSO₄?

m = n × M = 2 mol × 120.36 g/mol = 240.72 g.

See Also