Molar Mass of Sodium peroxide
Na2O2 — 77.978 g/mol, worked out element by element.
Molar mass of Sodium peroxide, Na₂O₂
77.978 g/mol
Molecular weight 77.978 · 4 atoms per formula unit
Also known as: na2o2.
Releases oxygen on contact with water or CO₂, which made it useful in submarines.
How 77.978 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Sodium | 2 | 22.99 | 45.980 | 58.97% |
| Oxygen | 2 | 15.999 | 31.998 | 41.03% |
| Total | 4 | 77.978 | 100% |
M = 2 × 22.990 + 2 × 15.999 = 77.978 g/mol
Grams to moles for Sodium peroxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0128 mol | 7.723 × 10^21 |
| 10 g | 0.1282 mol | 7.723 × 10^22 |
| 25 g | 0.3206 mol | 1.931 × 10^23 |
| 50 g | 0.6412 mol | 3.861 × 10^23 |
| 100 g | 1.2824 mol | 7.723 × 10^23 |
| 250 g | 3.2060 mol | 1.931 × 10^24 |
| 77.978 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 peroxide?
The molar mass of Sodium peroxide (Na2O2) is 77.978 g/mol. That is the sum of the standard atomic weights of all 4 atoms in one formula unit: 2 × 22.990 + 2 × 15.999 = 77.978.
What is the molecular weight of Sodium peroxide?
77.978 — 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 77.98 and a molar mass of 77.98 g/mol are the same answer.
How many moles are in 100 g of Sodium peroxide?
100 ÷ 77.978 = 1.2824 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 peroxide?
By mass, Sodium peroxide is 58.97% sodium, 41.03% oxygen. Each element's share is its total mass in the formula divided by 77.978.
How many atoms are in one formula unit of Sodium peroxide?
4: 2 sodium, 2 oxygen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Sodium peroxide contains 4 × 6.022 × 10²³ atoms in total.