Molar Mass of Ammonia

M(\mathrm{NH_3}) = 0.017031\ \text{kg/mol}

Value	17.031 g/mol (0.017031 kg/mol) Use in the calculator →
Status	Measured: ± 0.0012 g/mol (7 × 10⁻⁵ relative), standard uncertainty
Source	IUPAC
Categories	Chemistry

Molar Mass of Ammonia in every molar mass unit

Unit	Value
gram per mole	17.031 g/mol
kilogram per mole	0.017031 kg/mol
kilogram per kilomole	17.031 kg/kmol
milligram per millimole	17.031 mg/mmol
pound per pound-mole	17.031 lb/lb-mol
dalton (as molar mass)	17.031 Da
kilodalton (as molar mass)	0.017031 kDa

Learning zone

Ammonia at 17.031 g/mol contains 14.007 g/mol of nitrogen, so the ratio 17.031/14.007 = 1.216 converts between the two ways every laboratory reports it. A permit written as 5 mg/L "as N" is 6.08 mg/L "as NH₃"; confusing the two is one of the most common and most expensive unit errors in wastewater compliance.

Ammonia is also a refrigerant, R-717, and a lighter-than-air gas at 0.73 g/L, which is why a leak in an industrial plant room rises rather than pooling. In water it forms a weak base with pK_b 4.75, so the split between toxic free NH₃ and comparatively harmless NH₄⁺ swings sharply with pH: at pH 7 barely 0.6 % of total ammonia is the free form, at pH 9 it is 36 %, which is exactly why a fish kill can follow an otherwise harmless pH excursion.

Used by 3 solvers

Henderson–Hasselbalch Equation (Weak Acid Buffer)

\mathrm{pH} = \mathrm{p}K_a + \log_{10}\!\frac{[\mathrm{A^-}]}{[\mathrm{HA}]}

Molarity (C = n/V)

C = \frac{n}{V}

Moles from Mass (n = m/M)

n = \frac{m}{M}

Revised 16 October 2026

Cite this page

formula.expert. (2026, October 16). Molar Mass of Ammonia. https://formula.expert/constants/molar-mass-ammonia