Molar Mass of Acetylene
C2H2 — 26.038 g/mol, worked out element by element.
Molar mass of Acetylene, C₂H₂
26.038 g/mol
Molecular weight 26.038 · 4 atoms per formula unit
Also known as: c2h2, ethyne.
The triple bond that makes oxy-acetylene flames hot enough to cut steel.
How 26.038 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Carbon | 2 | 12.011 | 24.022 | 92.26% |
| Hydrogen | 2 | 1.008 | 2.016 | 7.74% |
| Total | 4 | 26.038 | 100% |
M = 2 × 12.011 + 2 × 1.008 = 26.038 g/mol
Grams to moles for Acetylene
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0384 mol | 2.313 × 10^22 |
| 10 g | 0.3841 mol | 2.313 × 10^23 |
| 25 g | 0.9601 mol | 5.782 × 10^23 |
| 50 g | 1.9203 mol | 1.156 × 10^24 |
| 100 g | 3.8405 mol | 2.313 × 10^24 |
| 250 g | 9.6014 mol | 5.782 × 10^24 |
| 26.038 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.
Related compounds
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Frequently Asked Questions
What is the molar mass of Acetylene?
The molar mass of Acetylene (C2H2) is 26.038 g/mol. That is the sum of the standard atomic weights of all 4 atoms in one formula unit: 2 × 12.011 + 2 × 1.008 = 26.038.
What is the molecular weight of Acetylene?
26.038 — 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 26.04 and a molar mass of 26.04 g/mol are the same answer.
How many moles are in 100 g of Acetylene?
100 ÷ 26.038 = 3.8405 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Acetylene?
By mass, Acetylene is 92.26% carbon, 7.74% hydrogen. Each element's share is its total mass in the formula divided by 26.038.
How many atoms are in one formula unit of Acetylene?
4: 2 carbon, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Acetylene contains 4 × 6.022 × 10²³ atoms in total.