Molar Mass of KClO3

Molar Mass Calculator

What is the molar mass of KClO₃?

Answer

M(KClO₃) ≈

122.55 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 ≈ 31.91%	≈ 31.91%
Clchlorine	1	35.45	35.45 w ≈ 28.93%	≈ 28.93%
Ooxygen	3	15.999	47.997 w ≈ 39.17%	≈ 39.17%
Σ = 122.545 ≈ 122.55 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.

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

Mass fractions of the elements

O 39.17%

K 31.91%Cl 28.93%

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Molar masses of substances nearby

Formula	M, g/mol
Na₂SiO₃ (sodium metasilicate)	122.062
C₆H₅COOH (benzoic acid)	122.123
NaClO₄ (sodium perchlorate)	122.44
KClO₃	122.55
C₆H₅NO₂ (nitrobenzene)	123.111
CuCO₃ (copper(II) carbonate)	123.554
P₄ (white phosphorus)	123.896

FAQ

What is the molar mass of KClO3?

M(KClO₃) ≈ 122.55 g/mol

How to calculate the molar mass of KClO₃?

Add up the atomic weights of all the atoms in the formula: 39.098 + 35.45 + 3 × 15.999 = 122.545 ≈ 122.55 g/mol.

How many grams are in 2 moles of KClO₃?

m = n × M = 2 mol × 122.55 g/mol = 245.10 g.

See Also