Molar Mass of Potassium hydroxide
KOH — 56.105 g/mol, worked out element by element.
Molar mass of Potassium hydroxide, KOH
56.105 g/mol
Molecular weight 56.105 · 3 atoms per formula unit
Also known as: koh, caustic potash.
Sodium hydroxide's heavier twin, preferred in soft soaps and alkaline batteries.
How 56.105 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Potassium | 1 | 39.098 | 39.098 | 69.69% |
| Oxygen | 1 | 15.999 | 15.999 | 28.52% |
| Hydrogen | 1 | 1.008 | 1.008 | 1.80% |
| Total | 3 | 56.105 | 100% |
M = 1 × 39.098 + 1 × 15.999 + 1 × 1.008 = 56.105 g/mol
Grams to moles for Potassium hydroxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0178 mol | 1.073 × 10^22 |
| 10 g | 0.1782 mol | 1.073 × 10^23 |
| 25 g | 0.4456 mol | 2.683 × 10^23 |
| 50 g | 0.8912 mol | 5.367 × 10^23 |
| 100 g | 1.7824 mol | 1.073 × 10^24 |
| 250 g | 4.4559 mol | 2.683 × 10^24 |
| 56.105 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
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Frequently Asked Questions
What is the molar mass of Potassium hydroxide?
The molar mass of Potassium hydroxide (KOH) is 56.105 g/mol. That is the sum of the standard atomic weights of all 3 atoms in one formula unit: 1 × 39.098 + 1 × 15.999 + 1 × 1.008 = 56.105.
What is the molecular weight of Potassium hydroxide?
56.105 — 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 56.11 and a molar mass of 56.11 g/mol are the same answer.
How many moles are in 100 g of Potassium hydroxide?
100 ÷ 56.105 = 1.7824 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 hydroxide?
By mass, Potassium hydroxide is 69.69% potassium, 28.52% oxygen, 1.80% hydrogen. Each element's share is its total mass in the formula divided by 56.105.
How many atoms are in one formula unit of Potassium hydroxide?
3: 1 potassium, 1 oxygen, 1 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium hydroxide contains 3 × 6.022 × 10²³ atoms in total.