Molar Mass of Sodium carbonate decahydrate
Na2CO3·10H2O — 286.138 g/mol, worked out element by element.
Molar mass of Sodium carbonate decahydrate, Na₂CO₃·₁₀H₂O
286.138 g/mol
Molecular weight 286.138 · 36 atoms per formula unit · includes 10 waters of crystallisation
Also known as: na2co3.10h2o, washing soda crystals.
Washing soda crystals; they effloresce, losing water to the air and crumbling.
How 286.138 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 13 | 15.999 | 207.987 | 72.69% |
| Sodium | 2 | 22.99 | 45.980 | 16.07% |
| Hydrogen | 20 | 1.008 | 20.160 | 7.05% |
| Carbon | 1 | 12.011 | 12.011 | 4.20% |
| Total | 36 | 286.138 | 100% |
M = 13 × 15.999 + 2 × 22.990 + 20 × 1.008 + 1 × 12.011 = 286.138 g/mol
Grams to moles for Sodium carbonate decahydrate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0035 mol | 2.105 × 10^21 |
| 10 g | 0.0349 mol | 2.105 × 10^22 |
| 25 g | 0.0874 mol | 5.262 × 10^22 |
| 50 g | 0.1747 mol | 1.052 × 10^23 |
| 100 g | 0.3495 mol | 2.105 × 10^23 |
| 250 g | 0.8737 mol | 5.262 × 10^23 |
| 286.138 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 carbonate decahydrate?
The molar mass of Sodium carbonate decahydrate (Na2CO3·10H2O) is 286.138 g/mol. That is the sum of the standard atomic weights of all 36 atoms in one formula unit: 13 × 15.999 + 2 × 22.990 + 20 × 1.008 + 1 × 12.011 = 286.138.
What is the molecular weight of Sodium carbonate decahydrate?
286.138 — 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 286.14 and a molar mass of 286.14 g/mol are the same answer.
How many moles are in 100 g of Sodium carbonate decahydrate?
100 ÷ 286.138 = 0.3495 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 carbonate decahydrate?
By mass, Sodium carbonate decahydrate is 72.69% oxygen, 16.07% sodium, 7.05% hydrogen, 4.20% carbon. Each element's share is its total mass in the formula divided by 286.138.
How many atoms are in one formula unit of Sodium carbonate decahydrate?
36: 13 oxygen, 2 sodium, 20 hydrogen, 1 carbon. One mole contains 6.02214076 × 10²³ formula units, so a mole of Sodium carbonate decahydrate contains 36 × 6.022 × 10²³ atoms in total.