Molar Mass of NaOH (Sodium Hydroxide)

Molar Mass Calculator

What is the molar mass of NaOH?

Answer

M(NaOH) =

39.997 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
Nasodium	1	22.990	22.990 w ≈ 57.48%	≈ 57.48%
Ooxygen	1	15.999	15.999 w ≈ 40.00%	≈ 40.00%
Hhydrogen	1	1.0080	1.0080 w ≈ 2.52%	≈ 2.52%
Σ = 39.997 g/mol w = 100%				100%

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

Mass fractions of the elements

Na 57.48%O 40.00%

H 2.52%

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Molar masses of substances nearby

Formula	M, g/mol
F₂ (fluorine)	37.996
K (potassium)	39.098
Ar (argon)	39.95
NaOH (sodium hydroxide)	39.997
Ca (calcium)	40.078
SiC (silicon carbide)	40.096
MgO (magnesium oxide)	40.304

FAQ

What is the molar mass of NaOH?

M(NaOH) = 39.997 g/mol

How to calculate the molar mass of NaOH?

Add up the atomic weights of all the atoms in the formula: 22.990 + 15.999 + 1.0080 = 39.997 g/mol.

How many grams are in 2 moles of NaOH?

m = n × M = 2 mol × 39.997 g/mol = 79.994 g.

See Also