Home › Molar mass calculator › KCl
Molar massPotassium chloride
Molar mass of KCl (Potassium chloride)
The molar mass of KCl is 74.55 g/mol.
A salt used as a fertiliser; it gives a lilac flame test.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 39.098 + 1 × 35.453 = 74.55 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Potassium (K) | 1 | 39.098 | 39.098 | 52.44% |
| Chlorine (Cl) | 1 | 35.453 | 35.453 | 47.56% |
| Molar mass of KCl | 74.55 g/mol | |||
Moles to grams for KCl
Multiply the number of moles by 74.55 g/mol to get the mass, and divide a mass by 74.55 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 7.46 g | 1 g | 0.0134 mol |
| 0.25 mol | 18.64 g | 5 g | 0.0671 mol |
| 0.5 mol | 37.28 g | 10 g | 0.1341 mol |
| 1 mol | 74.55 g | 50 g | 0.6707 mol |
| 2 mol | 149.10 g | 100 g | 1.3414 mol |
| 5 mol | 372.75 g | 500 g | 6.7068 mol |
Frequently asked questions
What is the molar mass of KCl?
The molar mass of KCl (potassium chloride) is 74.55 g/mol, so one mole of potassium chloride weighs 74.55 grams.
How do you calculate the molar mass of KCl?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 39.098 + 1 × 35.453 = 74.55 g/mol.
What percentage of KCl is potassium?
Potassium makes up 52.44% of the mass of KCl.
How many grams are in one mole of KCl?
One mole of KCl has a mass of 74.55 grams, and contains 6.022 × 10²³ formula units.