Molar Mass of Cl2OS (Thionyl Chloride)

Molar Mass Calculator

What is the molar mass of Cl₂OS?

Answer

M(Cl₂OS) ≈

118.96 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, S: 32.06.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Clchlorine	2	35.45	70.90 w ≈ 59.60%	≈ 59.60%
Ooxygen	1	15.999	15.999 w ≈ 13.45%	≈ 13.45%
Ssulfur	1	32.06	32.06 w ≈ 26.95%	≈ 26.95%
Σ = 118.959 ≈ 118.96 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 59.60%

S 26.95%O 13.45%

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Molar masses of substances nearby

Formula	M, g/mol
NiCO₃ (nickel(II) carbonate)	118.701
Sn (tin)	118.71
CoCO₃ (cobalt(II) carbonate)	118.941
Cl₂OS (thionyl chloride)	118.96
KBr (potassium bromide)	119.002
CHCl₃ (chloroform)	119.37
HMnO₄ (permanganic acid)	119.942

FAQ

What is the molar mass of Cl2OS?

M(Cl₂OS) ≈ 118.96 g/mol

How to calculate the molar mass of Cl₂OS?

Add up the atomic weights of all the atoms in the formula: 2 × 35.45 + 15.999 + 32.06 = 118.959 ≈ 118.96 g/mol.

How many grams are in 2 moles of Cl₂OS?

m = n × M = 2 mol × 118.96 g/mol = 237.92 g.

See Also