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Molar massAluminium oxide
Molar mass of Al2O3 (Aluminium oxide)
The molar mass of Al2O3 is 101.96 g/mol.
Alumina, the ore from which aluminium is extracted by electrolysis.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
2 × 26.982 + 3 × 15.999 = 101.96 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Aluminium (Al) | 2 | 26.982 | 53.964 | 52.93% |
| Oxygen (O) | 3 | 15.999 | 47.997 | 47.07% |
| Molar mass of Al2O3 | 101.96 g/mol | |||
Moles to grams for Al2O3
Multiply the number of moles by 101.96 g/mol to get the mass, and divide a mass by 101.96 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 10.20 g | 1 g | 0.0098 mol |
| 0.25 mol | 25.49 g | 5 g | 0.0490 mol |
| 0.5 mol | 50.98 g | 10 g | 0.0981 mol |
| 1 mol | 101.96 g | 50 g | 0.4904 mol |
| 2 mol | 203.92 g | 100 g | 0.9808 mol |
| 5 mol | 509.81 g | 500 g | 4.9038 mol |
Experiments that use aluminium oxide
⚖️ Calculate any other formulaFrequently asked questions
What is the molar mass of Al2O3?
The molar mass of Al₂O₃ (aluminium oxide) is 101.96 g/mol, so one mole of aluminium oxide weighs 101.96 grams.
How do you calculate the molar mass of Al2O3?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 2 × 26.982 + 3 × 15.999 = 101.96 g/mol.
What percentage of Al2O3 is aluminium?
Aluminium makes up 52.93% of the mass of Al₂O₃.
How many grams are in one mole of Al2O3?
One mole of Al₂O₃ has a mass of 101.96 grams, and contains 6.022 × 10²³ formula units.