Molar Mass of Aluminium oxide
Al2O3 — 101.961 g/mol, worked out element by element.
Molar mass of Aluminium oxide, Al₂O₃
101.961 g/mol
Molecular weight 101.961 · 5 atoms per formula unit
Also known as: al2o3, aluminum oxide, alumina, corundum.
The self-healing film that stops aluminium corroding, and the feedstock for smelting it.
How 101.961 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Aluminum | 2 | 26.982 | 53.964 | 52.93% |
| Oxygen | 3 | 15.999 | 47.997 | 47.07% |
| Total | 5 | 101.961 | 100% |
M = 2 × 26.982 + 3 × 15.999 = 101.961 g/mol
Grams to moles for Aluminium oxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0098 mol | 5.906 × 10^21 |
| 10 g | 0.0981 mol | 5.906 × 10^22 |
| 25 g | 0.2452 mol | 1.477 × 10^23 |
| 50 g | 0.4904 mol | 2.953 × 10^23 |
| 100 g | 0.9808 mol | 5.906 × 10^23 |
| 250 g | 2.4519 mol | 1.477 × 10^24 |
| 101.961 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 oxide?
The molar mass of Aluminium oxide (Al2O3) is 101.961 g/mol. That is the sum of the standard atomic weights of all 5 atoms in one formula unit: 2 × 26.982 + 3 × 15.999 = 101.961.
What is the molecular weight of Aluminium oxide?
101.961 — 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 101.96 and a molar mass of 101.96 g/mol are the same answer.
How many moles are in 100 g of Aluminium oxide?
100 ÷ 101.961 = 0.9808 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 oxide?
By mass, Aluminium oxide is 52.93% aluminum, 47.07% oxygen. Each element's share is its total mass in the formula divided by 101.961.
How many atoms are in one formula unit of Aluminium oxide?
5: 2 aluminum, 3 oxygen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Aluminium oxide contains 5 × 6.022 × 10²³ atoms in total.