Molar Mass of C18H36O2 (Stearic Acid): Step by Step

What is the molar mass of C₁₈H₃₆O₂?

Answer

M(C₁₈H₃₆O₂) =

284.484 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	18	12.011	216.198 w ≈ 76.00%	≈ 76.00%
Hhydrogen	36	1.0080	36.2880 w ≈ 12.76%	≈ 12.76%
Ooxygen	2	15.999	31.998 w ≈ 11.25%	≈ 11.25%
Σ = 284.484 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.

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Formula	M, g/mol
C₁₈H₃₄O₂ (oleic acid)	282.468
P₄O₁₀ (phosphorus pentoxide)	283.886
FeH₈N₂O₈S₂ (ferrous ammonium sulfate)	284.04
C₁₈H₃₆O₂ (stearic acid)	284.484
Na₂CO₃·10H₂O (sodium carbonate decahydrate)	286.138
ZnSO₄·7H₂O (zinc sulfate heptahydrate)	287.54
CaWO₄ (calcium tungstate)	287.91