Molar Mass of CoCl2 (Cobaltous Chloride)

Molar Mass Calculator

What is the molar mass of CoCl₂?

Answer

M(CoCl₂) ≈

129.83 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.

COCl₂ (phosgene) is a different substance: M(COCl₂) = 98.91 g/mol.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Cocobalt	1	58.933	58.933 w ≈ 45.39%	≈ 45.39%
Clchlorine	2	35.45	70.90 w ≈ 54.61%	≈ 54.61%
Σ = 129.833 ≈ 129.83 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 54.61%Co 45.39%

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Molar masses of substances nearby

Formula	M, g/mol
C₁₀H₈ (naphthalene)	128.174
CdO (cadmium oxide)	128.41
NiCl₂ (nickel(II) chloride)	129.59
CoCl₂ (cobaltous chloride)	129.83
C₆H₁₀O₃ (ethyl acetoacetate)	130.143
Xe (xenon)	131.29
(NH₄)₂HPO₄ (dibasic ammonium phosphate)	132.056

FAQ

What is the molar mass of CoCl2?

M(CoCl₂) ≈ 129.83 g/mol

How to calculate the molar mass of CoCl₂?

Add up the atomic weights of all the atoms in the formula: 58.933 + 2 × 35.45 = 129.833 ≈ 129.83 g/mol.

How many grams are in 2 moles of CoCl₂?

m = n × M = 2 mol × 129.83 g/mol = 259.66 g.

See Also