Molar Mass of H2C2O4 (Oxalic Acid)

Molar Mass Calculator

What is the molar mass of H₂C₂O₄?

Answer

M(H₂C₂O₄) =

90.034 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
Hhydrogen	2	1.0080	2.0160 w ≈ 2.24%	≈ 2.24%
Ccarbon	2	12.011	24.022 w ≈ 26.68%	≈ 26.68%
Ooxygen	4	15.999	63.996 w ≈ 71.08%	≈ 71.08%
Σ = 90.034 g/mol w = 100%				100%

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

Mass fractions of the elements

O 71.08%

C 26.68%H 2.24%

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Molar masses of substances nearby

Formula	M, g/mol
Y (yttrium)	88.906
C₃H₇NO₂ (L-alanine)	89.094
Fe(OH)₂ (ferrous hydroxide)	89.859
H₂C₂O₄ (oxalic acid)	90.034
HC₃H₅O₃ (DL-lactic acid)	90.078
NaClO₂ (sodium chlorite)	90.44
NiS (nickel(II) sulfide)	90.75

FAQ

What is the molar mass of H2C2O4?

M(H₂C₂O₄) = 90.034 g/mol

How to calculate the molar mass of H₂C₂O₄?

Add up the atomic weights of all the atoms in the formula: 2 × 1.0080 + 2 × 12.011 + 4 × 15.999 = 90.034 g/mol.

How many grams are in 2 moles of H₂C₂O₄?

m = n × M = 2 mol × 90.034 g/mol = 180.068 g.

See Also