Molar Mass of Al2O3 (Aluminium Oxide)

Molar Mass Calculator

What is the molar mass of Al₂O₃?

Answer

M(Al₂O₃) =

101.961 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
Alaluminium	2	26.982	53.964 w ≈ 52.93%	≈ 52.93%
Ooxygen	3	15.999	47.997 w ≈ 47.07%	≈ 47.07%
Σ = 101.961 g/mol w = 100%				100%

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

Mass fractions of the elements

Al 52.93%O 47.07%

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Molar masses of substances nearby

Formula	M, g/mol
Ru (ruthenium)	101.07
KNO₃ (potassium nitrate)	101.102
C₆H₁₅N (triethylamine)	101.193
Al₂O₃ (aluminium oxide)	101.961
C₄H₆O₃ (acetic anhydride)	102.089
C₆H₁₃OH	102.177
NaBr (sodium bromide)	102.894

FAQ

What is the molar mass of Al2O3?

M(Al₂O₃) = 101.961 g/mol

How to calculate the molar mass of Al₂O₃?

Add up the atomic weights of all the atoms in the formula: 2 × 26.982 + 3 × 15.999 = 101.961 g/mol.

How many grams are in 2 moles of Al₂O₃?

m = n × M = 2 mol × 101.961 g/mol = 203.922 g.

See Also