Molar Mass of C8H18 (Octane)

Molar Mass Calculator

What is the molar mass of C₈H₁₈?

Answer

M(C₈H₁₈) =

114.232 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	8	12.011	96.088 w ≈ 84.12%	≈ 84.12%
Hhydrogen	18	1.0080	18.1440 w ≈ 15.88%	≈ 15.88%
Σ = 114.232 g/mol w = 100%				100%

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

Mass fractions of the elements

C 84.12%

H 15.88%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₅Cl (chlorobenzene)	112.56
C₄H₇N₃O (creatinine)	113.120
C₂HF₃O₂ (trifluoroacetic acid)	114.022
C₈H₁₈ (octane)	114.232
In (indium)	114.82
MnCO₃ (manganese carbonate)	114.946
NH₄H₂PO₄ (monobasic ammonium phosphate)	115.025

FAQ

What is the molar mass of C8H18?

M(C₈H₁₈) = 114.232 g/mol

How to calculate the molar mass of C₈H₁₈?

Add up the atomic weights of all the atoms in the formula: 8 × 12.011 + 18 × 1.0080 = 114.232 g/mol.

How many grams are in 2 moles of C₈H₁₈?

m = n × M = 2 mol × 114.232 g/mol = 228.464 g.

See Also