Molar Mass of Aluminium sulfate
Al2(SO4)3 — 342.132 g/mol, worked out element by element.
Molar mass of Aluminium sulfate, Al₂(SO₄)₃
342.132 g/mol
Molecular weight 342.132 · 17 atoms per formula unit
Also known as: al2(so4)3, aluminum sulfate, alum.
The coagulant that clarifies drinking water by clumping suspended particles.
How 342.132 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 12 | 15.999 | 191.988 | 56.12% |
| Sulfur | 3 | 32.06 | 96.180 | 28.11% |
| Aluminum | 2 | 26.982 | 53.964 | 15.77% |
| Total | 17 | 342.132 | 100% |
M = 12 × 15.999 + 3 × 32.060 + 2 × 26.982 = 342.132 g/mol
Grams to moles for Aluminium sulfate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0029 mol | 1.760 × 10^21 |
| 10 g | 0.0292 mol | 1.760 × 10^22 |
| 25 g | 0.0731 mol | 4.400 × 10^22 |
| 50 g | 0.1461 mol | 8.801 × 10^22 |
| 100 g | 0.2923 mol | 1.760 × 10^23 |
| 250 g | 0.7307 mol | 4.400 × 10^23 |
| 342.132 g | 1 mol | 6.022 × 10^23 |
For any other amount, use the molar mass calculator, or the molarity calculator to make up a solution of a given concentration.
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Frequently Asked Questions
What is the molar mass of Aluminium sulfate?
The molar mass of Aluminium sulfate (Al2(SO4)3) is 342.132 g/mol. That is the sum of the standard atomic weights of all 17 atoms in one formula unit: 12 × 15.999 + 3 × 32.060 + 2 × 26.982 = 342.132.
What is the molecular weight of Aluminium sulfate?
342.132 — the same number as the molar mass, but as a dimensionless ratio rather than in g/mol. The two terms describe the same arithmetic, so a molecular weight of 342.13 and a molar mass of 342.13 g/mol are the same answer.
How many moles are in 100 g of Aluminium sulfate?
100 ÷ 342.132 = 0.2923 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Aluminium sulfate?
By mass, Aluminium sulfate is 56.12% oxygen, 28.11% sulfur, 15.77% aluminum. Each element's share is its total mass in the formula divided by 342.132.
How many atoms are in one formula unit of Aluminium sulfate?
17: 12 oxygen, 3 sulfur, 2 aluminum. One mole contains 6.02214076 × 10²³ formula units, so a mole of Aluminium sulfate contains 17 × 6.022 × 10²³ atoms in total.