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Molecular formula

C8H18

24 compounds have this formula on CompoundList.

Molar mass
114.23g/mol
Monoisotopic mass
132.2538Da
Atoms
26
Elements
2
Rings plus double bonds
0

The formula C8H18 describes a molecule made of 8 carbon atoms and 18 hydrogen atoms. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.

Elemental composition

  • C Carbon × 884.12%
    12.011 × 8 = 96.088 g/mol
  • H Hydrogen × 1815.88%
    1.008 × 18 = 18.144 g/mol
Look up another formula

Compounds with the formula C8H18

Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.

Showing 1 to 24 of 24 compounds

Octane chemical structure, C8H18, CAS 111-65-9
Octane
CAS 111-65-9C8H18
2,2,4-Trimethylpentane chemical structure, C8H18, CAS 85404-20-2
2,2,4-Trimethylpentane
CAS 85404-20-2C8H18
2-Methylheptane chemical structure, C8H18, CAS 592-27-8
2-Methylheptane
CAS 592-27-8C8H18
3-Methylheptane chemical structure, C8H18, CAS 589-81-1
3-Methylheptane
CAS 589-81-1C8H18
2,3,4-Trimethylpentane chemical structure, C8H18, CAS 565-75-3
2,3,4-Trimethylpentane
CAS 565-75-3C8H18
2,3,3-Trimethylpentane chemical structure, C8H18, CAS 560-21-4
2,3,3-Trimethylpentane
CAS 560-21-4C8H18
2,4-Dimethylhexane chemical structure, C8H18, CAS 589-43-5
2,4-Dimethylhexane
CAS 589-43-5C8H18
2,2,3,3-Tetramethylbutane chemical structure, C8H18, CAS 594-82-1
2,2,3,3-Tetramethylbutane
CAS 594-82-1C8H18
2,2-Dimethylhexane chemical structure, C8H18, CAS 590-73-8
2,2-Dimethylhexane
CAS 590-73-8C8H18
4-Methylheptane chemical structure, C8H18, CAS 589-53-7
4-Methylheptane
CAS 589-53-7C8H18
2,3-Dimethylhexane chemical structure, C8H18, CAS 584-94-1
2,3-Dimethylhexane
CAS 584-94-1C8H18
2,5-Dimethylhexane chemical structure, C8H18, CAS 592-13-2
2,5-Dimethylhexane
CAS 592-13-2C8H18
3,4-Dimethylhexane chemical structure, C8H18, CAS 583-48-2
3,4-Dimethylhexane
CAS 583-48-2C8H18
3-Ethylhexane chemical structure, C8H18, CAS 619-99-8
3-Ethylhexane
CAS 619-99-8C8H18
3-Ethyl-3-methylpentane chemical structure, C8H18, CAS 1067-08-9
3-Ethyl-3-methylpentane
CAS 1067-08-9C8H18
3,3-Dimethylhexane chemical structure, C8H18, CAS 563-16-6
3,3-Dimethylhexane
CAS 563-16-6C8H18
2,2,3-Trimethylpentane chemical structure, C8H18, CAS 564-02-3
2,2,3-Trimethylpentane
CAS 564-02-3C8H18
2,2,4-Tri(methyl-d3)pentane-1,1,1,3,3,4,5,5,5-d9 chemical structure, C8H18, CAS 51685-57-5
2,2,4-Tri(methyl-d3)pentane-1,1,1,3,3,4,5,5,5-d9
CAS 51685-57-5C8H18
3-Ethyl-2-methylpentane chemical structure, C8H18, CAS 609-26-7
3-Ethyl-2-methylpentane
CAS 609-26-7C8H18
(2H18)Octane chemical structure, C8H18, CAS 17252-77-6
(2H18)Octane
CAS 17252-77-6C8H18
2,2,3-Trimethylpentane, (S)- chemical structure, C8H18, CAS 40824-48-4
2,2,3-Trimethylpentane, (S)-
CAS 40824-48-4C8H18
2,2,3-Trimethylpentane, (R)- chemical structure, C8H18, CAS 54665-47-3
2,2,3-Trimethylpentane, (R)-
CAS 54665-47-3C8H18
Butane--but-1-ene (1/1) chemical structure, C8H18, CAS 9021-92-5
Butane--but-1-ene (1/1)
CAS 9021-92-5C8H18
1,1,1,2,2,3,3,4,4,5,6,6,7,7,7-Pentadecadeuterio-5-(trideuteriomethyl)heptane chemical structure, C8H18, CAS 62884-45-1
1,1,1,2,2,3,3,4,4,5,6,6,7,7,7-Pentadecadeuterio-5-(trideuteriomethyl)heptane
CAS 62884-45-1C8H18

Frequently asked questions

What is the molar mass of C8H18?

The molar mass of C8H18 is 114.23 g/mol, calculated from standard atomic weights for 8 carbon atoms and 18 hydrogen atoms. The monoisotopic mass is 132.2538 Da.

How many compounds have the formula C8H18?

CompoundList lists 24 compounds with the molecular formula C8H18, including Octane, 2,2,4-Trimethylpentane, 2-Methylheptane. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.

What is the degree of unsaturation of C8H18?

C8H18 has a degree of unsaturation of 0. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.