Molar Mass of Hydrogen gas
H2 — 2.016 g/mol, worked out element by element.
Molar mass of Hydrogen gas, H₂
2.016 g/mol
Molecular weight 2.016 · 2 atoms per formula unit
Also known as: h2, dihydrogen.
The lightest molecule, and the one whose molar volume anchors gas-law worked examples.
How 2.016 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Hydrogen | 2 | 1.008 | 2.016 | 100.00% |
| Total | 2 | 2.016 | 100% |
M = 2 × 1.008 = 2.016 g/mol
Grams to moles for Hydrogen gas
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.4960 mol | 2.987 × 10^23 |
| 10 g | 4.9603 mol | 2.987 × 10^24 |
| 25 g | 12.4008 mol | 7.468 × 10^24 |
| 50 g | 24.8016 mol | 1.494 × 10^25 |
| 100 g | 49.6032 mol | 2.987 × 10^25 |
| 250 g | 124.0079 mol | 7.468 × 10^25 |
| 2.016 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 gas?
The molar mass of Hydrogen gas (H2) is 2.016 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 2 × 1.008 = 2.016.
What is the molecular weight of Hydrogen gas?
2.016 — 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 2.02 and a molar mass of 2.02 g/mol are the same answer.
How many moles are in 100 g of Hydrogen gas?
100 ÷ 2.016 = 49.6032 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 gas?
By mass, Hydrogen gas is 100.00% hydrogen. Each element's share is its total mass in the formula divided by 2.016.
How many atoms are in one formula unit of Hydrogen gas?
2: 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Hydrogen gas contains 2 × 6.022 × 10²³ atoms in total.