Molar Mass of FeCl2 (Ferrous Chloride)

Molar Mass Calculator

What is the molar mass of FeCl₂?

Answer

M(FeCl₂) ≈

126.75 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Cl: 35.45.

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 ≈ 44.06%	≈ 44.06%
Clchlorine	2	35.45	70.90 w ≈ 55.94%	≈ 55.94%
Σ = 126.745 ≈ 126.75 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 55.94%Fe 44.06%

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Molar masses of substances nearby

Formula	M, g/mol
Na₂SO₃ (sodium sulfite)	126.04
C₂H₆O₆	126.064
C₅H₆N₂O₂ (thymine)	126.115
FeCl₂ (ferrous chloride)	126.75
AgF (silver fluoride)	126.87
I (iodine)	126.90
Te (tellurium)	127.60

FAQ

What is the molar mass of FeCl2?

M(FeCl₂) ≈ 126.75 g/mol

How to calculate the molar mass of FeCl₂?

Add up the atomic weights of all the atoms in the formula: 55.845 + 2 × 35.45 = 126.745 ≈ 126.75 g/mol.

How many grams are in 2 moles of FeCl₂?

m = n × M = 2 mol × 126.75 g/mol = 253.50 g.

See Also