Molar Mass of C6H7NO3S (Sulfanilic Acid): Step by Step

What is the molar mass of C₆H₇NO₃S?

Answer

M(C₆H₇NO₃S) ≈

173.19 g/mol

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

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ccarbon	6	12.011	72.066 w ≈ 41.61%	≈ 41.61%
Hhydrogen	7	1.0080	7.0560 w ≈ 4.07%	≈ 4.07%
Nnitrogen	1	14.007	14.007 w ≈ 8.09%	≈ 8.09%
Ooxygen	3	15.999	47.997 w ≈ 27.71%	≈ 27.71%
Ssulfur	1	32.06	32.06 w ≈ 18.51%	≈ 18.51%
Σ = 173.186 ≈ 173.19 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
CeO₂ (cerium(IV) oxide)	172.12
CaSO₄·2H₂O (calcium sulfate dihydrate)	172.16
Yb (ytterbium)	173.05
C₆H₇NO₃S (sulfanilic acid)	173.19
K₂HPO₄ (dibasic potassium phosphate)	174.174
C₆H₁₄N₄O₂ (L-arginine)	174.204
K₂SO₄ (potassium sulfate)	174.25