Molar Mass of CH3OH (Methanol)

Molar Mass Calculator

What is the molar mass of CH₃OH?

Answer

M(CH₃OH) =

32.042 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
Ccarbon	1	12.011	12.011 w ≈ 37.49%	≈ 37.49%
Hhydrogen	4	1.0080	4.0320 w ≈ 12.58%	≈ 12.58%
Ooxygen	1	15.999	15.999 w ≈ 49.93%	≈ 49.93%
Σ = 32.042 g/mol w = 100%				100%

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

Mass fractions of the elements

O 49.93%C 37.49%

H 12.58%

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Molar masses of substances nearby

Formula	M, g/mol
P (phosphorus)	30.974
CH₅N (methylamine)	31.058
O₂ (oxygen)	31.998
CH₃OH (methanol)	32.042
N₂H₄ (hydrazine)	32.046
S (sulfur)	32.06
PH₃ (phosphine)	33.998

FAQ

What is the molar mass of CH3OH?

M(CH₃OH) = 32.042 g/mol

How to calculate the molar mass of CH₃OH?

Add up the atomic weights of all the atoms in the formula: 12.011 + 4 × 1.0080 + 15.999 = 32.042 g/mol.

How many grams are in 2 moles of CH₃OH?

m = n × M = 2 mol × 32.042 g/mol = 64.084 g.

See Also