Molar Mass of Hydrogen peroxide
H2O2 — 34.014 g/mol, worked out element by element.
Molar mass of Hydrogen peroxide, H₂O₂
34.014 g/mol
Molecular weight 34.014 · 4 atoms per formula unit
Also known as: h2o2, peroxide.
One extra oxygen against water, and a completely different oxidising character.
How 34.014 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 2 | 15.999 | 31.998 | 94.07% |
| Hydrogen | 2 | 1.008 | 2.016 | 5.93% |
| Total | 4 | 34.014 | 100% |
M = 2 × 15.999 + 2 × 1.008 = 34.014 g/mol
Grams to moles for Hydrogen peroxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0294 mol | 1.770 × 10^22 |
| 10 g | 0.2940 mol | 1.770 × 10^23 |
| 25 g | 0.7350 mol | 4.426 × 10^23 |
| 50 g | 1.4700 mol | 8.852 × 10^23 |
| 100 g | 2.9400 mol | 1.770 × 10^24 |
| 250 g | 7.3499 mol | 4.426 × 10^24 |
| 34.014 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 Hydrogen peroxide?
The molar mass of Hydrogen peroxide (H2O2) is 34.014 g/mol. That is the sum of the standard atomic weights of all 4 atoms in one formula unit: 2 × 15.999 + 2 × 1.008 = 34.014.
What is the molecular weight of Hydrogen peroxide?
34.014 — 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 34.01 and a molar mass of 34.01 g/mol are the same answer.
How many moles are in 100 g of Hydrogen peroxide?
100 ÷ 34.014 = 2.9400 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Hydrogen peroxide?
By mass, Hydrogen peroxide is 94.07% oxygen, 5.93% hydrogen. Each element's share is its total mass in the formula divided by 34.014.
How many atoms are in one formula unit of Hydrogen peroxide?
4: 2 oxygen, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Hydrogen peroxide contains 4 × 6.022 × 10²³ atoms in total.