Molar Mass of Potassium chloride
KCl — 74.548 g/mol, worked out element by element.
Molar mass of Potassium chloride, KCl
74.548 g/mol
Molecular weight 74.548 · 2 atoms per formula unit
Also known as: kcl, sylvite.
A potassium fertiliser and the salt substitute for low-sodium diets.
How 74.548 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Potassium | 1 | 39.098 | 39.098 | 52.45% |
| Chlorine | 1 | 35.45 | 35.450 | 47.55% |
| Total | 2 | 74.548 | 100% |
M = 1 × 39.098 + 1 × 35.450 = 74.548 g/mol
Grams to moles for Potassium chloride
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0134 mol | 8.078 × 10^21 |
| 10 g | 0.1341 mol | 8.078 × 10^22 |
| 25 g | 0.3354 mol | 2.020 × 10^23 |
| 50 g | 0.6707 mol | 4.039 × 10^23 |
| 100 g | 1.3414 mol | 8.078 × 10^23 |
| 250 g | 3.3535 mol | 2.020 × 10^24 |
| 74.548 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 chloride?
The molar mass of Potassium chloride (KCl) is 74.548 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 39.098 + 1 × 35.450 = 74.548.
What is the molecular weight of Potassium chloride?
74.548 — 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 74.55 and a molar mass of 74.55 g/mol are the same answer.
How many moles are in 100 g of Potassium chloride?
100 ÷ 74.548 = 1.3414 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 chloride?
By mass, Potassium chloride is 52.45% potassium, 47.55% chlorine. Each element's share is its total mass in the formula divided by 74.548.
How many atoms are in one formula unit of Potassium chloride?
2: 1 potassium, 1 chlorine. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium chloride contains 2 × 6.022 × 10²³ atoms in total.