Molar Mass of Al2(SO4)3 (Aluminium Sulfate)

Molar Mass Calculator

What is the molar mass of Al₂(SO₄)₃?

Answer

M(Al₂(SO₄)₃) ≈

342.13 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — S: 32.06.

Al₂(SO₄)₃ = 2 Al + 3 × (S + 4 O) → Al 2, S 3, O 12

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 ≈ 15.77%	≈ 15.77%
Ssulfur	3	32.06	96.18 w ≈ 28.11%	≈ 28.11%
Ooxygen	12	15.999	191.988 w ≈ 56.12%	≈ 56.12%
Σ = 342.132 ≈ 342.13 g/mol w = 100%				100%

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

Mass fractions of the elements

O 56.12%

S 28.11%Al 15.77%

Related Calculations

See Also

Liters to Kilograms - How many kilograms are in a liter of water, honey, gasoline, sand and other substances — by density
Grams to Kg - Convert Grams to Kilograms
Percentage Calculator: Fraction to Percent - What percentage one number is of another? Convert fraction into a percentage
Scientific Calculator with Memory & History - Free Engineering Calculator Online with Memory Function, Operation History, Logarithms & Trigonometry. Similar to ti-83, ti-84, ti-89

Recalculate with different values ↑

Molar masses of substances nearby

Formula	M, g/mol
(CH₃COO)₂Pb (lead(II) acetate)	325.3
CCs₂O₃ (cesium carbonate)	325.83
Pb(NO₃)₂ (lead(II) nitrate)	331.2
Al₂(SO₄)₃ (aluminium sulfate)	342.13
C₁₂H₂₂O₁₁ (sucrose)	342.297
AgC₁₀H₉N₄SO₂	357.14
Na₂B₄O₇·10H₂O	381.36

FAQ

What is the molar mass of Al2(SO4)3?

M(Al₂(SO₄)₃) ≈ 342.13 g/mol

How to calculate the molar mass of Al₂(SO₄)₃?

Add up the atomic weights of all the atoms in the formula: 2 × 26.982 + 3 × 32.06 + 12 × 15.999 = 342.132 ≈ 342.13 g/mol.

How many grams are in 2 moles of Al₂(SO₄)₃?

m = n × M = 2 mol × 342.13 g/mol = 684.26 g.

See Also