Molar Mass of SO2 (Sulfur Dioxide)

Molar Mass Calculator

What is the molar mass of SO₂?

Answer

M(SO₂) ≈

64.06 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — S: 32.06.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ssulfur	1	32.06	32.06 w ≈ 50.05%	≈ 50.05%
Ooxygen	2	15.999	31.998 w ≈ 49.95%	≈ 49.95%
Σ = 64.058 ≈ 64.06 g/mol w = 100%				100%

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

Mass fractions of the elements

S 50.05%O 49.95%

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Molar masses of substances nearby

Formula	M, g/mol
C₂H₃Cl (vinyl chloride)	62.50
HNO₃ (nitric acid)	63.012
Cu (copper)	63.546
SO₂ (sulfur dioxide)	64.06
CaC₂ (calcium carbide)	64.100
C₂H₅Cl (chloroethane)	64.51
NaN₃ (sodium azide)	65.011

FAQ

What is the molar mass of SO2?

M(SO₂) ≈ 64.06 g/mol

How to calculate the molar mass of SO₂?

Add up the atomic weights of all the atoms in the formula: 32.06 + 2 × 15.999 = 64.058 ≈ 64.06 g/mol.

How many grams are in 2 moles of SO₂?

m = n × M = 2 mol × 64.06 g/mol = 128.12 g.

See Also