Molar Mass of Potassium permanganate
KMnO4 — 158.032 g/mol, worked out element by element.
Molar mass of Potassium permanganate, KMnO₄
158.032 g/mol
Molecular weight 158.032 · 6 atoms per formula unit
Also known as: kmno4.
The deep purple oxidiser of redox titrations; it is its own indicator, because the endpoint decolourises.
How 158.032 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 4 | 15.999 | 63.996 | 40.50% |
| Manganese | 1 | 54.938 | 54.938 | 34.76% |
| Potassium | 1 | 39.098 | 39.098 | 24.74% |
| Total | 6 | 158.032 | 100% |
M = 4 × 15.999 + 1 × 54.938 + 1 × 39.098 = 158.032 g/mol
Grams to moles for Potassium permanganate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0063 mol | 3.811 × 10^21 |
| 10 g | 0.0633 mol | 3.811 × 10^22 |
| 25 g | 0.1582 mol | 9.527 × 10^22 |
| 50 g | 0.3164 mol | 1.905 × 10^23 |
| 100 g | 0.6328 mol | 3.811 × 10^23 |
| 250 g | 1.5820 mol | 9.527 × 10^23 |
| 158.032 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 permanganate?
The molar mass of Potassium permanganate (KMnO4) is 158.032 g/mol. That is the sum of the standard atomic weights of all 6 atoms in one formula unit: 4 × 15.999 + 1 × 54.938 + 1 × 39.098 = 158.032.
What is the molecular weight of Potassium permanganate?
158.032 — 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 158.03 and a molar mass of 158.03 g/mol are the same answer.
How many moles are in 100 g of Potassium permanganate?
100 ÷ 158.032 = 0.6328 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 permanganate?
By mass, Potassium permanganate is 40.50% oxygen, 34.76% manganese, 24.74% potassium. Each element's share is its total mass in the formula divided by 158.032.
How many atoms are in one formula unit of Potassium permanganate?
6: 4 oxygen, 1 manganese, 1 potassium. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium permanganate contains 6 × 6.022 × 10²³ atoms in total.