Molar Mass of Sodium hydroxide
NaOH — 39.997 g/mol, worked out element by element.
Molar mass of Sodium hydroxide, NaOH
39.997 g/mol
Molecular weight 39.997 · 3 atoms per formula unit
Also known as: naoh, caustic soda, lye.
The strong base of titrations and soap-making; hygroscopic enough that weighing it accurately is genuinely hard.
How 39.997 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Sodium | 1 | 22.99 | 22.990 | 57.48% |
| Oxygen | 1 | 15.999 | 15.999 | 40.00% |
| Hydrogen | 1 | 1.008 | 1.008 | 2.52% |
| Total | 3 | 39.997 | 100% |
M = 1 × 22.990 + 1 × 15.999 + 1 × 1.008 = 39.997 g/mol
Grams to moles for Sodium hydroxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0250 mol | 1.506 × 10^22 |
| 10 g | 0.2500 mol | 1.506 × 10^23 |
| 25 g | 0.6250 mol | 3.764 × 10^23 |
| 50 g | 1.2501 mol | 7.528 × 10^23 |
| 100 g | 2.5002 mol | 1.506 × 10^24 |
| 250 g | 6.2505 mol | 3.764 × 10^24 |
| 39.997 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 Sodium hydroxide?
The molar mass of Sodium hydroxide (NaOH) is 39.997 g/mol. That is the sum of the standard atomic weights of all 3 atoms in one formula unit: 1 × 22.990 + 1 × 15.999 + 1 × 1.008 = 39.997.
What is the molecular weight of Sodium hydroxide?
39.997 — 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 40.00 and a molar mass of 40.00 g/mol are the same answer.
How many moles are in 100 g of Sodium hydroxide?
100 ÷ 39.997 = 2.5002 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Sodium hydroxide?
By mass, Sodium hydroxide is 57.48% sodium, 40.00% oxygen, 2.52% hydrogen. Each element's share is its total mass in the formula divided by 39.997.
How many atoms are in one formula unit of Sodium hydroxide?
3: 1 sodium, 1 oxygen, 1 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Sodium hydroxide contains 3 × 6.022 × 10²³ atoms in total.