Molar Mass of CaSO4 (Calcium Sulfate): Step by Step

What is the molar mass of CaSO₄?

Answer

M(CaSO₄) ≈

136.13 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
Cacalcium	1	40.078	40.078 w ≈ 29.44%	≈ 29.44%
Ssulfur	1	32.06	32.06 w ≈ 23.55%	≈ 23.55%
Ooxygen	4	15.999	63.996 w ≈ 47.01%	≈ 47.01%
Σ = 136.134 ≈ 136.13 g/mol w = 100%				100%

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Formula	M, g/mol
C₈H₉NO (acetanilide)	135.166
CaHPO₄ (dicalcium phosphate)	136.056
KH₂PO₄ (monobasic potassium phosphate)	136.084
CaSO₄ (calcium sulfate)	136.13
ZnCl₂ (zinc chloride)	136.28
C₆H₇N₃O (isoniazid)	137.142
PCl₃ (phosphorus trichloride)	137.32