Molar Mass of HClO4 (Perchloric Acid)

Molar Mass Calculator

What is the molar mass of HClO₄?

Answer

M(HClO₄) ≈

100.45 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 ≈ 1.00%	≈ 1.00%
Clchlorine	1	35.45	35.45 w ≈ 35.29%	≈ 35.29%
Ooxygen	4	15.999	63.996 w ≈ 63.71%	≈ 63.71%
Σ = 100.454 ≈ 100.45 g/mol w = 100%				100%

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

Mass fractions of the elements

O 63.71%Cl 35.29%

H 1.00%

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Molar masses of substances nearby

Formula	M, g/mol
KHCO₃ (potassium hydrogen carbonate)	100.114
C₆H₁₂O (cyclohexanol)	100.161
C₇H₁₆ (n-heptane)	100.205
HClO₄ (perchloric acid)	100.45
Ru (ruthenium)	101.07
KNO₃ (potassium nitrate)	101.102
C₆H₁₅N (triethylamine)	101.193

FAQ

What is the molar mass of HClO4?

M(HClO₄) ≈ 100.45 g/mol

How to calculate the molar mass of HClO₄?

Add up the atomic weights of all the atoms in the formula: 1.0080 + 35.45 + 4 × 15.999 = 100.454 ≈ 100.45 g/mol.

How many grams are in 2 moles of HClO₄?

m = n × M = 2 mol × 100.45 g/mol = 200.90 g.

See Also