Molar Mass of HCl (Hydrogen Chloride)

Molar Mass Calculator

What is the molar mass of HCl?

Answer

M(HCl) ≈

36.46 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
Hhydrogen	1	1.0080	1.0080 w ≈ 2.76%	≈ 2.76%
Clchlorine	1	35.45	35.45 w ≈ 97.24%	≈ 97.24%
Σ = 36.458 ≈ 36.46 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 97.24%

H 2.76%

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Molar masses of substances nearby

Formula	M, g/mol
H₂S (hydrogen sulfide)	34.08
NH₄OH	35.046
Cl (chlorine)	35.45
HCl (hydrogen chloride)	36.46
NH₄F (ammonium fluoride)	37.037
NaBH₄ (sodium borohydride)	37.83
F₂ (fluorine)	37.996

FAQ

What is the molar mass of HCl?

M(HCl) ≈ 36.46 g/mol

How to calculate the molar mass of HCl?

Add up the atomic weights of all the atoms in the formula: 1.0080 + 35.45 = 36.458 ≈ 36.46 g/mol.

How many grams are in 2 moles of HCl?

m = n × M = 2 mol × 36.46 g/mol = 72.92 g.

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