Molar Mass of Dinitrogen

M(\mathrm{N_2}) = 0.028014\ \text{kg/mol}

Value	0.028014 kg/mol
Status	Measured: ± 0.000002 kg/mol (0.000071 relative)
Source	IUPAC
Categories	Chemistry molar-mass

M(N₂) in every molar mass unit

gram per mole	28.014 g/mol
kilogram per mole	0.028014 kg/mol

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.

Used by these solvers

Moles from Mass (n = m/M)

n = \frac{m}{M}

Ideal Gas Law

P V = n R T

Gas Density from Molar Mass

\rho = \frac{PM}{RT}