Molecular formula

C₂₇H₁₈

13 compounds have this formula on CompoundList.

Molar mass: 342.44g/mol
Monoisotopic mass: 342.1409Da
Atoms: 45
Elements: 2
Rings plus double bonds: 19

The formula C27H18 describes a molecule made of 27 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 × 2794.70%
12.011 × 27 = 324.297 g/mol
H Hydrogen × 185.30%
1.008 × 18 = 18.144 g/mol

Look up another formula

Compounds with the formula C27H18

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

Showing 1 to 13 of 13 compounds

AR-M 7 3-Methylphenanthro(3,4-C)phenanthrene

CAS 83844-21-7C₂₇H₁₈

Truxene

CAS 548-35-6C₂₇H₁₈

9H-Tribenzo(a,f,l)trindene, 14,15-dihydro-

CAS 17509-71-6C₂₇H₁₈

3'-Phenylspiro(9H-fluorene-9,1'-(1H)indene)

CAS 1455-23-8C₂₇H₁₈

13-Phenyl-13H-dibenzo[a,i]fluorene

CAS 7464-65-5C₂₇H₁₈

9H-Fluorene, 9-(9H-fluoren-9-ylidenemethyl)-

CAS 3912-47-8C₂₇H₁₈

3-Benzylperylene

CAS 58508-83-1C₂₇H₁₈

1-Cyclopenta-1,3-dien-1-ylpentaphene

CAS 1296951-11-5C₂₇H₁₈

5-Methylhexahelicene

CAS 26832-51-9C₂₇H₁₈

1,2,3-Trimethylcoronene

CAS 113382-86-8C₂₇H₁₈

9-(9H-Fluoren-9-yl)anthracene

CAS 1242278-81-4C₂₇H₁₈

Methylene, 1,3,5-benzenetriyltris[phenyl-

CAS 41021-10-7C₂₇H₁₈

9-(9H-Fluoren-9-ylidene)-2-methyl-9H-fluorene

CAS 42189-88-8C₂₇H₁₈

Frequently asked questions

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What is the molar mass of C27H18?

The molar mass of C27H18 is 342.44 g/mol, calculated from standard atomic weights for 27 carbon atoms and 18 hydrogen atoms. The monoisotopic mass is 342.1409 Da.

How many compounds have the formula C27H18?

CompoundList lists 13 compounds with the molecular formula C27H18, including AR-M 7 3-Methylphenanthro(3,4-C)phenanthrene, Truxene, 9H-Tribenzo(a,f,l)trindene, 14,15-dihydro-. 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 C27H18?

C27H18 has a degree of unsaturation of 19. 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.