Molar Mass of Cl2 (Chlorine)

Molar Mass Calculator

What is the molar mass of Cl₂?

Answer

M(Cl₂) =

70.90 g/mol

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

One Cl atom: M(Cl) = 35.45 g/mol; Cl₂ is two atoms.

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 = 100.00%	100.00%

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

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Molar Mass of Cl (Chlorine): Step by Step

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Molar masses of substances nearby

Formula	M, g/mol
B₂O₃ (diboron trioxide)	69.62
Ga (gallium)	69.723
C₅H₁₀ (cyclopentane)	70.135
Cl₂ (chlorine)	70.90
MnO (manganese(II) oxide)	70.937
C₃H₅NO (acrylamide)	71.079
FeO (iron(II) oxide)	71.844

FAQ

What is the molar mass of Cl2?

M(Cl₂) = 70.90 g/mol

How to calculate the molar mass of Cl₂?

Add up the atomic weights of all the atoms in the formula: 2 × 35.45 = 70.90 g/mol.

How many grams are in 2 moles of Cl₂?

m = n × M = 2 mol × 70.90 g/mol = 141.80 g.

See Also