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.
Related compounds
Can't find the exact calculator you need?
Describe it in one sentence — get a working, math-verified calculator in seconds. Free, no signup.
Build your own calculatorRelated Calculators
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.