Molar Mass of Dinitrogen
| Value | 28.014 g/mol (0.028014 kg/mol) |
| Status | Measured: ± 0.002 g/mol (7.1 × 10⁻⁵ relative), standard uncertainty |
| Source | IUPAC |
| Categories | Chemistry |
| Unit | Value |
|---|---|
| gram per mole | 28.014 g/mol |
| kilogram per mole | 0.028014 kg/mol |
| kilogram per kilomole | 28.014 kg/kmol |
| milligram per millimole | 28.014 mg/mmol |
| pound per pound-mole | 28.014 lb/lb-mol |
| dalton (as molar mass) | 28.014 Da |
| kilodalton (as molar mass) | 0.028014 kDa |
Learning zone
Nitrogen makes up 78.08 % of dry air by volume and at 28.014 g/mol it is what sets air's effective molar mass of 28.96 g/mol, the number behind the specific gas constant of 287.05 J/(kg·K) used throughout HVAC and aerodynamics. Anything lighter than 28.96 g/mol rises in air and anything heavier sinks, which is the entire safety logic for hydrogen (2.016), helium (4.003), methane (16.043) and propane (44.10).
The triple bond that makes N₂ so unreactive (945 kJ/mol, one of the strongest in chemistry) is why the atmosphere is four-fifths fertiliser that plants cannot touch. Breaking it at scale took the Haber–Bosch process of 1909–13, which now fixes roughly 150 million tonnes of nitrogen a year and, by most estimates, feeds about half the people alive. Every tonne of that ammonia is metered by this molar mass.
Cite this page
formula.expert. (2026, October 16). Molar Mass of Dinitrogen. https://formula.expert/constants/molar-mass-nitrogen-gas