Molar Mass of Cl (Chlorine)

Molar Mass Calculator

What is the molar mass of Cl?

Answer

M(Cl) =

35.45 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Elemental chlorine is made of Cl₂ molecules: M(Cl₂) = 70.90 g/mol = 0.07090 kg/mol.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Clchlorine	1	35.45	35.45 w = 100.00%	100.00%

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

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Neighbouring elements of the periodic table

Formula	M, g/mol
Si (silicon)	28.085
P (phosphorus)	30.974
S (sulfur)	32.06
Cl (chlorine)	35.45
Ar (argon)	39.95
K (potassium)	39.098
Ca (calcium)	40.078

FAQ

What is the molar mass of Cl?

M(Cl) = 35.45 g/mol

Why is the molar mass of chlorine 35.45 and not 71?

35.45 g/mol is the mass of one mole of Cl atoms. Elemental chlorine is made of Cl₂ molecules: M(Cl₂) = 2 × 35.45 = 70.90 g/mol (71 in school problems); in SI units, 0.07090 kg/mol. In a problem about the gas, the molar mass of chlorine is usually M(Cl₂).

How many grams are in 2 moles of Cl?

m = n × M = 2 mol × 35.45 g/mol = 70.90 g.

See Also