Molar Mass of C16H18ClN3S (Methylene Blue): Step by Step

What is the molar mass of C₁₆H₁₈ClN₃S?

Answer

M(C₁₆H₁₈ClN₃S) ≈

319.85 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Cl: 35.45, S: 32.06.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ccarbon	16	12.011	192.176 w ≈ 60.08%	≈ 60.08%
Hhydrogen	18	1.0080	18.1440 w ≈ 5.67%	≈ 5.67%
Clchlorine	1	35.45	35.45 w ≈ 11.08%	≈ 11.08%
Nnitrogen	3	14.007	42.021 w ≈ 13.14%	≈ 13.14%
Ssulfur	1	32.06	32.06 w ≈ 10.02%	≈ 10.02%
Σ = 319.851 ≈ 319.85 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
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
PbCrO₄ (lead(II) chromate)	323.2
Hg(NO₃)₂ (mercuric nitrate)	324.60