Molar mass of CO2 (Carbon dioxide)
The molar mass of CO2 is 44.01 g/mol.
The gas that turns limewater milky; made by respiration, combustion and acids on carbonates.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 12.011 + 2 × 15.999 = 44.01 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Carbon (C) | 1 | 12.011 | 12.011 | 27.29% |
| Oxygen (O) | 2 | 15.999 | 31.998 | 72.71% |
| Molar mass of CO2 | 44.01 g/mol | |||
Moles to grams for CO2
Multiply the number of moles by 44.01 g/mol to get the mass, and divide a mass by 44.01 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 4.40 g | 1 g | 0.0227 mol |
| 0.25 mol | 11.00 g | 5 g | 0.1136 mol |
| 0.5 mol | 22.00 g | 10 g | 0.2272 mol |
| 1 mol | 44.01 g | 50 g | 1.1361 mol |
| 2 mol | 88.02 g | 100 g | 2.2723 mol |
| 5 mol | 220.05 g | 500 g | 11.3613 mol |
Experiments that use carbon dioxide
🫧 CO₂ and limewater
Marble + acid makes CO₂. Bubble it through limewater: milky, then clear again in excess.
🌋 Baking-soda volcano
Vinegar + bicarbonate + washing-up liquid produce a frothy eruption.
Frequently asked questions
What is the molar mass of CO2?
The molar mass of CO₂ (carbon dioxide) is 44.01 g/mol, so one mole of carbon dioxide weighs 44.01 grams.
How do you calculate the molar mass of CO2?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 12.011 + 2 × 15.999 = 44.01 g/mol.
What percentage of CO2 is oxygen?
Oxygen makes up 72.71% of the mass of CO₂.
How many grams are in one mole of CO2?
One mole of CO₂ has a mass of 44.01 grams, and contains 6.022 × 10²³ formula units.