Molar Mass of Na₂CO₃
Sodium carbonate (washing soda, soda ash). Two Na⁺ ions balance one carbonate ion, CO₃²⁻.
Molar mass of Na2CO3
105.988 g/mol
2 × 22.99 + 1 × 12.011 + 3 × 15.999 = 105.988
Calculation, element by element
| Element | Atoms | Atomic mass (g/mol) | Subtotal | Mass % |
|---|---|---|---|---|
| Sodium (Na) | 2 | 22.99 | 45.980 | 43.38% |
| Carbon (C) | 1 | 12.011 | 12.011 | 11.33% |
| Oxygen (O) | 3 | 15.999 | 47.997 | 45.29% |
| Total | 105.988 | 100% |
= 0.09435 mol = 5.6819 × 1022 formula units
Na₂CO₃ molar mass FAQ
What is the molar mass of sodium carbonate (Na₂CO₃)?
105.988 g/mol. It is the sum of the atomic masses of every atom in the formula: 2 × 22.99 + 1 × 12.011 + 3 × 15.999 = 105.988 g/mol.
How many grams are in one mole of Na₂CO₃?
105.988 g. Molar mass is the mass of one mole (6.022 × 10²³ formula units), so 1 mol of Na₂CO₃ weighs 105.988 g and 0.5 mol weighs 52.994 g.
How many moles are in 10 g of Na₂CO₃?
10 g ÷ 105.988 g/mol = 0.09435 mol.
What is the percent composition of Na₂CO₃?
Sodium 43.38%, Carbon 11.33%, Oxygen 45.29%.
Is molecular weight the same as molar mass for Na₂CO₃?
Numerically yes: the molecular (or formula) weight is 105.988 u per formula unit, and the molar mass is 105.988 g/mol.
Molar masses of other common compounds
H2O WaterNaCl Sodium chlorideNaOH Sodium hydroxideC6H12O6 GlucoseCO2 Carbon dioxideHCl Hydrochloric acidH2SO4 Sulfuric acidO2 Oxygen gasCaCO3 Calcium carbonateC2H5OH EthanolNH3 AmmoniaN2 Nitrogen gasCH4 MethaneCuSO4 Copper(II) sulfateKMnO4 Potassium permanganateMgCl2 Magnesium chlorideCuSO4·5H2O Copper(II) sulfate pentahydrateNaHCO3 Sodium bicarbonateKCl 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