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Molar massPotassium hydroxide
Molar mass of KOH (Potassium hydroxide)
The molar mass of KOH is 56.11 g/mol.
A strong alkali used in alkaline batteries and soft soaps.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 39.098 + 1 × 15.999 + 1 × 1.008 = 56.11 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Potassium (K) | 1 | 39.098 | 39.098 | 69.69% |
| Oxygen (O) | 1 | 15.999 | 15.999 | 28.52% |
| Hydrogen (H) | 1 | 1.008 | 1.008 | 1.80% |
| Molar mass of KOH | 56.11 g/mol | |||
Moles to grams for KOH
Multiply the number of moles by 56.11 g/mol to get the mass, and divide a mass by 56.11 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 5.61 g | 1 g | 0.0178 mol |
| 0.25 mol | 14.03 g | 5 g | 0.0891 mol |
| 0.5 mol | 28.05 g | 10 g | 0.1782 mol |
| 1 mol | 56.11 g | 50 g | 0.8912 mol |
| 2 mol | 112.21 g | 100 g | 1.7824 mol |
| 5 mol | 280.53 g | 500 g | 8.9119 mol |
Frequently asked questions
What is the molar mass of KOH?
The molar mass of KOH (potassium hydroxide) is 56.11 g/mol, so one mole of potassium hydroxide weighs 56.11 grams.
How do you calculate the molar mass of KOH?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 39.098 + 1 × 15.999 + 1 × 1.008 = 56.11 g/mol.
What percentage of KOH is potassium?
Potassium makes up 69.69% of the mass of KOH.
How many grams are in one mole of KOH?
One mole of KOH has a mass of 56.11 grams, and contains 6.022 × 10²³ formula units.