Molar Mass of KMnO4 (Potassium Permanganate)

Molar Mass Calculator

What is the molar mass of KMnO₄?

Answer

M(KMnO₄) =

158.032 g/mol

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

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 ≈ 24.74%	≈ 24.74%
Mnmanganese	1	54.938	54.938 w ≈ 34.76%	≈ 34.76%
Ooxygen	4	15.999	63.996 w ≈ 40.50%	≈ 40.50%
Σ = 158.032 g/mol w = 100%				100%

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

Mass fractions of the elements

O 40.50%

Mn 34.76%K 24.74%

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Molar masses of substances nearby

Formula	M, g/mol
CaCrO₄ (calcium chromate)	156.070
C₆H₅Br (bromobenzene)	157.010
Gd (gadolinium)	157.25
KMnO₄ (potassium permanganate)	158.032
Na₂S₂O₃ (sodium thiosulfate)	158.10
(CH₃COO)₂Ca (calcium acetate)	158.166
K₂SO₃ (potassium sulfite)	158.25

FAQ

What is the molar mass of KMnO4?

M(KMnO₄) = 158.032 g/mol

How to calculate the molar mass of KMnO₄?

Add up the atomic weights of all the atoms in the formula: 39.098 + 54.938 + 4 × 15.999 = 158.032 g/mol.

How many grams are in 2 moles of KMnO₄?

m = n × M = 2 mol × 158.032 g/mol = 316.064 g.

See Also