Molar Mass of FeS2 (Ferrous Disulfide)

Molar Mass Calculator

What is the molar mass of FeS₂?

Answer

M(FeS₂) ≈

119.97 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
Feiron	1	55.845	55.845 w ≈ 46.55%	≈ 46.55%
Ssulfur	2	32.06	64.12 w ≈ 53.45%	≈ 53.45%
Σ = 119.965 ≈ 119.97 g/mol w = 100%				100%

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

Mass fractions of the elements

S 53.45%Fe 46.55%

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Molar masses of substances nearby

Formula	M, g/mol
KBr (potassium bromide)	119.002
CHCl₃ (chloroform)	119.37
HMnO₄ (permanganic acid)	119.942
FeS₂ (ferrous disulfide)	119.97
NaH₂PO₄ (monosodium phosphate)	119.976
NaHSO₄ (sodium bisulfate)	120.05
C₄H₈O₄	120.104

FAQ

What is the molar mass of FeS2?

M(FeS₂) ≈ 119.97 g/mol

How to calculate the molar mass of FeS₂?

Add up the atomic weights of all the atoms in the formula: 55.845 + 2 × 32.06 = 119.965 ≈ 119.97 g/mol.

How many grams are in 2 moles of FeS₂?

m = n × M = 2 mol × 119.97 g/mol = 239.94 g.

See Also