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.
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 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.