Molar Mass of HClO3 (Chloric Acid)

Molar Mass Calculator

What is the molar mass of HClO₃?

Answer

M(HClO₃) ≈

84.46 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 ≈ 1.19%	≈ 1.19%
Clchlorine	1	35.45	35.45 w ≈ 41.98%	≈ 41.98%
Ooxygen	3	15.999	47.997 w ≈ 56.83%	≈ 56.83%
Σ = 84.455 ≈ 84.46 g/mol w = 100%				100%

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

Mass fractions of the elements

O 56.83%Cl 41.98%

H 1.19%

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Molar masses of substances nearby

Formula	M, g/mol
CHKO₂ (potassium formate)	84.115
C₆H₁₂ (cyclohexane)	84.162
MgCO₃ (magnesium carbonate)	84.313
HClO₃ (chloric acid)	84.46
CH₂Cl₂ (dichloromethane)	84.93
NaNO₃ (sodium nitrate)	84.994
KNO₂ (potassium nitrite)	85.103

FAQ

What is the molar mass of HClO3?

M(HClO₃) ≈ 84.46 g/mol

How to calculate the molar mass of HClO₃?

Add up the atomic weights of all the atoms in the formula: 1.0080 + 35.45 + 3 × 15.999 = 84.455 ≈ 84.46 g/mol.

How many grams are in 2 moles of HClO₃?

m = n × M = 2 mol × 84.46 g/mol = 168.92 g.

See Also