Molar Mass of KCl (Potassium Chloride)

Molar Mass Calculator

What is the molar mass of KCl?

Answer

M(KCl) ≈

74.55 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
Kpotassium	1	39.098	39.098 w ≈ 52.45%	≈ 52.45%
Clchlorine	1	35.45	35.45 w ≈ 47.55%	≈ 47.55%
Σ = 74.548 ≈ 74.55 g/mol w = 100%				100%

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

Mass fractions of the elements

K 52.45%Cl 47.55%

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Molar masses of substances nearby

Formula	M, g/mol
Ca(OH)₂ (calcium hydroxide)	74.092
CH₃CH₂OCH₂CH₃ (diethyl ether)	74.123
NaOCl (sodium hypochlorite)	74.44
KCl (potassium chloride)	74.55
NiO (nickel(II) oxide)	74.692
As (arsenic)	74.922
CoO (cobalt(II) oxide)	74.932

FAQ

What is the molar mass of KCl?

M(KCl) ≈ 74.55 g/mol

How to calculate the molar mass of KCl?

Add up the atomic weights of all the atoms in the formula: 39.098 + 35.45 = 74.548 ≈ 74.55 g/mol.

How many grams are in 2 moles of KCl?

m = n × M = 2 mol × 74.55 g/mol = 149.10 g.

See Also