Molar Mass of C4H4O4 (Fumaric Acid): Step by Step

What is the molar mass of C₄H₄O₄?

Answer

M(C₄H₄O₄) =

116.072 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	4	12.011	48.044 w ≈ 41.39%	≈ 41.39%
Hhydrogen	4	1.0080	4.0320 w ≈ 3.47%	≈ 3.47%
Ooxygen	4	15.999	63.996 w ≈ 55.13%	≈ 55.13%
Σ = 116.072 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 99.99%; unrounded, they make exactly 100%.

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Formula	M, g/mol
MnCO₃ (manganese carbonate)	114.946
NH₄H₂PO₄ (monobasic ammonium phosphate)	115.025
C₅H₉NO₂ (DL-proline)	115.132
C₄H₄O₄ (fumaric acid)	116.072
CH₃CH₂CH₂CO₂CH₂CH₃ (ethyl butyrate)	116.160
C₅H₁₁NO₂ (L-valine)	117.148
C₈H₇N (1H-indole)	117.151