Molar Mass of Potassium nitrate
KNO3 — 101.102 g/mol, worked out element by element.
Molar mass of Potassium nitrate, KNO₃
101.102 g/mol
Molecular weight 101.102 · 5 atoms per formula unit
Also known as: kno3, saltpeter, saltpetre, nitre.
The oxidiser in black powder, and a classic solubility-curve example.
How 101.102 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 3 | 15.999 | 47.997 | 47.47% |
| Potassium | 1 | 39.098 | 39.098 | 38.67% |
| Nitrogen | 1 | 14.007 | 14.007 | 13.85% |
| Total | 5 | 101.102 | 100% |
M = 3 × 15.999 + 1 × 39.098 + 1 × 14.007 = 101.102 g/mol
Grams to moles for Potassium nitrate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0099 mol | 5.957 × 10^21 |
| 10 g | 0.0989 mol | 5.957 × 10^22 |
| 25 g | 0.2473 mol | 1.489 × 10^23 |
| 50 g | 0.4946 mol | 2.978 × 10^23 |
| 100 g | 0.9891 mol | 5.957 × 10^23 |
| 250 g | 2.4728 mol | 1.489 × 10^24 |
| 101.102 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 Potassium nitrate?
The molar mass of Potassium nitrate (KNO3) is 101.102 g/mol. That is the sum of the standard atomic weights of all 5 atoms in one formula unit: 3 × 15.999 + 1 × 39.098 + 1 × 14.007 = 101.102.
What is the molecular weight of Potassium nitrate?
101.102 — 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 101.10 and a molar mass of 101.10 g/mol are the same answer.
How many moles are in 100 g of Potassium nitrate?
100 ÷ 101.102 = 0.9891 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Potassium nitrate?
By mass, Potassium nitrate is 47.47% oxygen, 38.67% potassium, 13.85% nitrogen. Each element's share is its total mass in the formula divided by 101.102.
How many atoms are in one formula unit of Potassium nitrate?
5: 3 oxygen, 1 potassium, 1 nitrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium nitrate contains 5 × 6.022 × 10²³ atoms in total.