Molar Mass of C20H14O4 (Phenolphthalein): Step by Step

What is the molar mass of C₂₀H₁₄O₄?

Answer

M(C₂₀H₁₄O₄) =

318.328 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	20	12.011	240.220 w ≈ 75.46%	≈ 75.46%
Hhydrogen	14	1.0080	14.1120 w ≈ 4.43%	≈ 4.43%
Ooxygen	4	15.999	63.996 w ≈ 20.10%	≈ 20.10%
Σ = 318.328 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
Ba(ClO₃)₂ (barium chlorate)	304.22
Ca₃(PO₄)₂ (tricalcium phosphate)	310.174
Ag₂SO₄ (silver sulfate)	311.80
C₂₀H₁₄O₄ (phenolphthalein)	318.328
ZnI₂ (zinc iodide)	319.18
C₁₆H₁₈ClN₃S (methylene blue)	319.85
Na₂SO₄·10H₂O (sodium sulfate decahydrate)	322.19