Molar Mass of C7H8O2 (Guaiacol)

Molar Mass Calculator

What is the molar mass of C₇H₈O₂?

Answer

M(C₇H₈O₂) =

124.139 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 ≈ 67.73%	≈ 67.73%
Hhydrogen	8	1.0080	8.0640 w ≈ 6.50%	≈ 6.50%
Ooxygen	2	15.999	31.998 w ≈ 25.78%	≈ 25.78%
Σ = 124.139 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%.

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

Mass fractions of the elements

C 67.73%

O 25.78%H 6.50%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₅NO₂ (nitrobenzene)	123.111
CuCO₃ (copper(II) carbonate)	123.554
P₄ (white phosphorus)	123.896
C₇H₈O₂ (guaiacol)	124.139
ZnCO₃ (zinc carbonate)	125.39
SrF₂ (strontium fluoride)	125.62
MnCl₂ (manganese(II) chloride)	125.84

FAQ

What is the molar mass of C7H8O2?

M(C₇H₈O₂) = 124.139 g/mol

How to calculate the molar mass of C₇H₈O₂?

Add up the atomic weights of all the atoms in the formula: 7 × 12.011 + 8 × 1.0080 + 2 × 15.999 = 124.139 g/mol.

How many grams are in 2 moles of C₇H₈O₂?

m = n × M = 2 mol × 124.139 g/mol = 248.278 g.

See Also