Molar Mass of CO (Carbon Monoxide)

Molar Mass Calculator

What is the molar mass of CO?

Answer

M(CO) =

28.010 g/mol

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

Co (cobalt) is a different substance: M(Co) = 58.933 g/mol.

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 ≈ 42.88%	≈ 42.88%
Ooxygen	1	15.999	15.999 w ≈ 57.12%	≈ 57.12%
Σ = 28.010 g/mol w = 100%				100%

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

Mass fractions of the elements

O 57.12%C 42.88%

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Molar masses of substances nearby

Formula	M, g/mol
C₂H₂ (acetylene)	26.038
Al (aluminium)	26.982
CHN (hydrogen cyanide)	27.026
CO (carbon monoxide)	28.010
N₂ (nitrogen)	28.014
C₂H₄ (ethylene)	28.054
Si (silicon)	28.085

FAQ

What is the molar mass of CO?

M(CO) = 28.010 g/mol

How to calculate the molar mass of CO?

Add up the atomic weights of all the atoms in the formula: 12.011 + 15.999 = 28.010 g/mol.

How many grams are in 2 moles of CO?

m = n × M = 2 mol × 28.010 g/mol = 56.020 g.

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