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Molecular formula

C18H18

112 compounds have this formula on CompoundList.

Molar mass
234.34g/mol
Monoisotopic mass
234.1409Da
Atoms
36
Elements
2
Rings plus double bonds
10

The formula C18H18 describes a molecule made of 18 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 × 1892.26%
    12.011 × 18 = 216.198 g/mol
  • H Hydrogen × 187.74%
    1.008 × 18 = 18.144 g/mol
Look up another formula

Compounds with the formula C18H18

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

Showing 101 to 112 of 112 compounds

7-(3,5-Dimethylphenyl)-2-methyl-1H-indene chemical structure, C18H18, CAS 1099379-07-3
7-(3,5-Dimethylphenyl)-2-methyl-1H-indene
CAS 1099379-07-3C18H18
4-(2-Methylpent-3-yn-2-yl)-1,1'-biphenyl chemical structure, C18H18, CAS 62283-63-0
4-(2-Methylpent-3-yn-2-yl)-1,1'-biphenyl
CAS 62283-63-0C18H18
1,1'-Bi(cyclonona-1,3,5,7-tetraene) chemical structure, C18H18, CAS 112262-94-9
1,1'-Bi(cyclonona-1,3,5,7-tetraene)
CAS 112262-94-9C18H18
1-[1-(Cyclopenta-2,4-dien-1-yl)cyclobutyl]-1H-indene chemical structure, C18H18, CAS 393517-22-1
1-[1-(Cyclopenta-2,4-dien-1-yl)cyclobutyl]-1H-indene
CAS 393517-22-1C18H18
1,1'-(2-Ethenyl-2-methylcyclopropane-1,1-diyl)dibenzene chemical structure, C18H18, CAS 39520-10-0
1,1'-(2-Ethenyl-2-methylcyclopropane-1,1-diyl)dibenzene
CAS 39520-10-0C18H18
1,1'-(4-Methylpenta-1,4-diene-1,2-diyl)dibenzene chemical structure, C18H18, CAS 652131-11-8
1,1'-(4-Methylpenta-1,4-diene-1,2-diyl)dibenzene
CAS 652131-11-8C18H18
1,1'-(Hexa-1,4-diene-1,2-diyl)dibenzene chemical structure, C18H18, CAS 652131-09-4
1,1'-(Hexa-1,4-diene-1,2-diyl)dibenzene
CAS 652131-09-4C18H18
1,1'-(Hexa-1,5-diene-2,4-diyl)dibenzene chemical structure, C18H18, CAS 63779-63-5
1,1'-(Hexa-1,5-diene-2,4-diyl)dibenzene
CAS 63779-63-5C18H18
(3-Benzyl-2-methylbuta-1,3-dien-1-yl)benzene chemical structure, C18H18, CAS 62640-73-7
(3-Benzyl-2-methylbuta-1,3-dien-1-yl)benzene
CAS 62640-73-7C18H18
(2-Benzylpenta-3,4-dien-1-yl)benzene chemical structure, C18H18, CAS 919285-08-8
(2-Benzylpenta-3,4-dien-1-yl)benzene
CAS 919285-08-8C18H18
(1E,10E,11Z,13Z)-Tricyclo[8.4.2.24,7]octadeca-1(15),4,6,10(16),11,13,17-heptaene chemical structure, C18H18
(1E,10E,11Z,13Z)-Tricyclo[8.4.2.24,7]octadeca-1(15),4,6,10(16),11,13,17-heptaene
C18H18
(6aS,11aS)-11a-Methyl-5,6,6a,11-tetrahydrobenzo[a]fluorene chemical structure, C18H18, CAS 137675-27-5
(6aS,11aS)-11a-Methyl-5,6,6a,11-tetrahydrobenzo[a]fluorene
CAS 137675-27-5C18H18

Frequently asked questions

What is the molar mass of C18H18?

The molar mass of C18H18 is 234.34 g/mol, calculated from standard atomic weights for 18 carbon atoms and 18 hydrogen atoms. The monoisotopic mass is 234.1409 Da.

How many compounds have the formula C18H18?

CompoundList lists 112 compounds with the molecular formula C18H18, including 7-(3,5-Dimethylphenyl)-2-methyl-1H-indene, 4-(2-Methylpent-3-yn-2-yl)-1,1'-biphenyl, 1,1'-Bi(cyclonona-1,3,5,7-tetraene). 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 C18H18?

C18H18 has a degree of unsaturation of 10. 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.