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Molar massPotassium nitrate
Molar mass of KNO3 (Potassium nitrate)
The molar mass of KNO3 is 101.10 g/mol.
Saltpetre, an oxidiser in fireworks and gunpowder.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 39.098 + 1 × 14.007 + 3 × 15.999 = 101.10 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Potassium (K) | 1 | 39.098 | 39.098 | 38.67% |
| Nitrogen (N) | 1 | 14.007 | 14.007 | 13.85% |
| Oxygen (O) | 3 | 15.999 | 47.997 | 47.47% |
| Molar mass of KNO3 | 101.10 g/mol | |||
Moles to grams for KNO3
Multiply the number of moles by 101.10 g/mol to get the mass, and divide a mass by 101.10 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 10.11 g | 1 g | 0.0099 mol |
| 0.25 mol | 25.28 g | 5 g | 0.0495 mol |
| 0.5 mol | 50.55 g | 10 g | 0.0989 mol |
| 1 mol | 101.10 g | 50 g | 0.4946 mol |
| 2 mol | 202.20 g | 100 g | 0.9891 mol |
| 5 mol | 505.51 g | 500 g | 4.9455 mol |
Frequently asked questions
What is the molar mass of KNO3?
The molar mass of KNO₃ (potassium nitrate) is 101.10 g/mol, so one mole of potassium nitrate weighs 101.10 grams.
How do you calculate the molar mass of KNO3?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 39.098 + 1 × 14.007 + 3 × 15.999 = 101.10 g/mol.
What percentage of KNO3 is oxygen?
Oxygen makes up 47.47% of the mass of KNO₃.
How many grams are in one mole of KNO3?
One mole of KNO₃ has a mass of 101.10 grams, and contains 6.022 × 10²³ formula units.