Molar Mass of Ethanol
C2H5OH — 46.069 g/mol, worked out element by element.
Molar mass of Ethanol, C₂H₅OH
46.069 g/mol
Molecular weight 46.069 · 9 atoms per formula unit
Also known as: c2h5oh, ethyl alcohol, alcohol, c2h6o.
Drinking alcohol and a fuel; the alcohol every substitution and oxidation example starts from.
How 46.069 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Carbon | 2 | 12.011 | 24.022 | 52.14% |
| Oxygen | 1 | 15.999 | 15.999 | 34.73% |
| Hydrogen | 6 | 1.008 | 6.048 | 13.13% |
| Total | 9 | 46.069 | 100% |
M = 2 × 12.011 + 1 × 15.999 + 6 × 1.008 = 46.069 g/mol
Grams to moles for Ethanol
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0217 mol | 1.307 × 10^22 |
| 10 g | 0.2171 mol | 1.307 × 10^23 |
| 25 g | 0.5427 mol | 3.268 × 10^23 |
| 50 g | 1.0853 mol | 6.536 × 10^23 |
| 100 g | 2.1707 mol | 1.307 × 10^24 |
| 250 g | 5.4266 mol | 3.268 × 10^24 |
| 46.069 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 Ethanol?
The molar mass of Ethanol (C2H5OH) is 46.069 g/mol. That is the sum of the standard atomic weights of all 9 atoms in one formula unit: 2 × 12.011 + 1 × 15.999 + 6 × 1.008 = 46.069.
What is the molecular weight of Ethanol?
46.069 — 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 46.07 and a molar mass of 46.07 g/mol are the same answer.
How many moles are in 100 g of Ethanol?
100 ÷ 46.069 = 2.1707 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Ethanol?
By mass, Ethanol is 52.14% carbon, 34.73% oxygen, 13.13% hydrogen. Each element's share is its total mass in the formula divided by 46.069.
How many atoms are in one formula unit of Ethanol?
9: 2 carbon, 1 oxygen, 6 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Ethanol contains 9 × 6.022 × 10²³ atoms in total.