Molar Mass of NH3 (Ammonia)

Molar Mass Calculator

What is the molar mass of NH₃?

Answer

M(NH₃) =

17.031 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Nnitrogen	1	14.007	14.007 w ≈ 82.24%	≈ 82.24%
Hhydrogen	3	1.0080	3.0240 w ≈ 17.76%	≈ 17.76%
Σ = 17.031 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

N 82.24%

H 17.76%

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Molar masses of substances nearby

Formula	M, g/mol
N (nitrogen)	14.007
O (oxygen)	15.999
CH₄ (methane)	16.043
NH₃ (ammonia)	17.031
H₂O (water)	18.015
F (fluorine)	18.998
HF (hydrogen fluoride)	20.006

FAQ

What is the molar mass of NH3?

M(NH₃) = 17.031 g/mol

How to calculate the molar mass of NH₃?

Add up the atomic weights of all the atoms in the formula: 14.007 + 3 × 1.0080 = 17.031 g/mol.

How many grams are in 2 moles of NH₃?

m = n × M = 2 mol × 17.031 g/mol = 34.062 g.

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