Molar Mass of CO2 (Carbon Dioxide)

Molar Mass Calculator

What is the molar mass of CO₂?

Answer

M(CO₂) =

44.009 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 ≈ 27.29%	≈ 27.29%
Ooxygen	2	15.999	31.998 w ≈ 72.71%	≈ 72.71%
Σ = 44.009 g/mol w = 100%				100%

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

Mass fractions of the elements

O 72.71%

C 27.29%

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Molar masses of substances nearby

Formula	M, g/mol
C₃H₆ (propylene)	42.081
LiCl (lithium chloride)	42.39
HN₃ (hydrogen azide)	43.029
CO₂ (carbon dioxide)	44.009
N₂O (nitrous oxide)	44.013
CH₃COH (acetaldehyde)	44.053
C₃H₈ (propane)	44.097

FAQ

What is the molar mass of CO2?

M(CO₂) = 44.009 g/mol

How to calculate the molar mass of CO₂?

Add up the atomic weights of all the atoms in the formula: 12.011 + 2 × 15.999 = 44.009 g/mol.

How many grams are in 2 moles of CO₂?

m = n × M = 2 mol × 44.009 g/mol = 88.018 g.

See Also