Molar Mass of C₂H₅OH
Ethanol (ethyl alcohol, C₂H₆O). Often written C₂H₆O. Both formulas contain 2 C, 6 H and 1 O and give the same molar mass.
Molar mass of C2H5OH
46.069 g/mol
2 × 12.011 + 6 × 1.008 + 1 × 15.999 = 46.069
Calculation, element by element
| Element | Atoms | Atomic mass (g/mol) | Subtotal | Mass % |
|---|---|---|---|---|
| Carbon (C) | 2 | 12.011 | 24.022 | 52.14% |
| Hydrogen (H) | 6 | 1.008 | 6.048 | 13.13% |
| Oxygen (O) | 1 | 15.999 | 15.999 | 34.73% |
| Total | 46.069 | 100% |
= 0.21707 mol = 1.3072 × 1023 formula units
C₂H₅OH molar mass FAQ
What is the molar mass of ethanol (C₂H₅OH)?
46.069 g/mol. It is the sum of the atomic masses of every atom in the formula: 2 × 12.011 + 6 × 1.008 + 1 × 15.999 = 46.069 g/mol.
How many grams are in one mole of C₂H₅OH?
46.069 g. Molar mass is the mass of one mole (6.022 × 10²³ formula units), so 1 mol of C₂H₅OH weighs 46.069 g and 0.5 mol weighs 23.035 g.
How many moles are in 10 g of C₂H₅OH?
10 g ÷ 46.069 g/mol = 0.2171 mol.
What is the percent composition of C₂H₅OH?
Carbon 52.14%, Hydrogen 13.13%, Oxygen 34.73%.
Is molecular weight the same as molar mass for C₂H₅OH?
Numerically yes: the molecular (or formula) weight is 46.069 u per formula unit, and the molar mass is 46.069 g/mol.
Molar masses of other common compounds
H2O WaterNaCl Sodium chlorideNaOH Sodium hydroxideC6H12O6 GlucoseCO2 Carbon dioxideHCl Hydrochloric acidH2SO4 Sulfuric acidO2 Oxygen gasCaCO3 Calcium carbonateNH3 AmmoniaN2 Nitrogen gasCH4 MethaneCuSO4 Copper(II) sulfateKMnO4 Potassium permanganateMgCl2 Magnesium chlorideCuSO4·5H2O Copper(II) sulfate pentahydrateNaHCO3 Sodium bicarbonateNa2CO3 Sodium carbonateKCl Potassium chlorideHNO3 Nitric acidH3PO4 Phosphoric acidCH3COOH Acetic acidC12H22O11 SucroseH2O2 Hydrogen peroxideCa(OH)2 Calcium hydroxideFe2O3 Iron(III) oxideAl2O3 Aluminium oxideAgNO3 Silver nitrateNH4NO3 Ammonium nitrateC8H10N4O2 CaffeineC9H8O4 AspirinC3H8 PropaneC8H18 OctaneH2 Hydrogen gasCl2 Chlorine gasO3 OzoneCO Carbon monoxideSO2 Sulfur dioxideKOH Potassium hydroxideMgO Magnesium oxideCaCl2 Calcium chlorideNaNO3 Sodium nitrateK2Cr2O7 Potassium dichromateBaSO4 Barium sulfate