Molar Mass of FeS (Iron(II) Sulfide)

Molar Mass Calculator

What is the molar mass of FeS?

Answer

M(FeS) ≈

87.91 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 ≈ 63.53%	≈ 63.53%
Ssulfur	1	32.06	32.06 w ≈ 36.47%	≈ 36.47%
Σ = 87.905 ≈ 87.91 g/mol w = 100%				100%

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

Mass fractions of the elements

Fe 63.53%S 36.47%

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Molar masses of substances nearby

Formula	M, g/mol
LiBr (lithium bromide)	86.84
MnO₂	86.936
Sr (strontium)	87.62
FeS (iron(II) sulfide)	87.91
C₃H₄O₃ (pyruvic acid)	88.062
CH₃COOC₂H₅ (ethyl acetate)	88.106
C₅H₁₂O (isoamyl alcohol)	88.150

FAQ

What is the molar mass of FeS?

M(FeS) ≈ 87.91 g/mol

How to calculate the molar mass of FeS?

Add up the atomic weights of all the atoms in the formula: 55.845 + 32.06 = 87.905 ≈ 87.91 g/mol.

How many grams are in 2 moles of FeS?

m = n × M = 2 mol × 87.91 g/mol = 175.82 g.

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