Molar Mass of C7H6O3 (Salicylic Acid)

Molar Mass Calculator

What is the molar mass of C₇H₆O₃?

Answer

M(C₇H₆O₃) =

138.122 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	7	12.011	84.077 w ≈ 60.87%	≈ 60.87%
Hhydrogen	6	1.0080	6.0480 w ≈ 4.38%	≈ 4.38%
Ooxygen	3	15.999	47.997 w ≈ 34.75%	≈ 34.75%
Σ = 138.122 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

C 60.87%

O 34.75%H 4.38%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₇N₃O (isoniazid)	137.142
PCl₃ (phosphorus trichloride)	137.32
Ba (barium)	137.33
C₇H₆O₃ (salicylic acid)	138.122
K₂CO₃ (potassium carbonate)	138.204
La (lanthanum)	138.91
Ce (cerium)	140.12

FAQ

What is the molar mass of C7H6O3?

M(C₇H₆O₃) = 138.122 g/mol

How to calculate the molar mass of C₇H₆O₃?

Add up the atomic weights of all the atoms in the formula: 7 × 12.011 + 6 × 1.0080 + 3 × 15.999 = 138.122 g/mol.

How many grams are in 2 moles of C₇H₆O₃?

m = n × M = 2 mol × 138.122 g/mol = 276.244 g.

See Also