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AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/octane
Quick Reference
| Formula / Notation | C8H18 |
|---|---|
| CAS Number | 111-65-9 |
| Molecular Weight | 114.23 |
| Melting Point | -70.2 °F (USCG, 1999) |
| Boiling Point | 258.1 °F at 760 mmHg (USCG, 1999) |
| Density | 0.703 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Solubility | 7e-05 % at 77 °F (NIOSH, 2024) |
| Appearance | N-octane is a colorless liquid with an odor of gasoline. Less dense than water and insoluble in water. Hence floats on water. Produces irritating vapor. |
| Also Known As | n-octane; 111-65-9; Oktan; Oktanen; Ottani; DTXSID0026882; X1RV0B2FJV; NSC-9822; DTXCID406882; CHEBI:17590 |
| Category | Organic Compounds |
What is Octane?
Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic.
Formula & Notation
C8H18
IUPAC Name: octane
Other Names / Synonyms: n-octane; 111-65-9; Oktan; Oktanen; Ottani; DTXSID0026882; X1RV0B2FJV; NSC-9822; DTXCID406882; CHEBI:17590
Properties & Characteristics
Appearance: N-octane is a colorless liquid with an odor of gasoline. Less dense than water and insoluble in water. Hence floats on water. Produces irritating vapor.. Molecular formula: C8H18. Molecular weight: 114.23 g/mol. Boiling point: 258.1 °F at 760 mmHg (USCG, 1999). Melting point: -70.2 °F (USCG, 1999). Density: 0.703 at 68 °F (USCG, 1999) - Less dense than water; will float. Solubility: 7e-05 % at 77 °F (NIOSH, 2024). Vapor pressure: 10 mmHg (NIOSH, 2024). LogP: 3.9.
Physical Data
| Property | Value |
|---|---|
| Melting Point | -70.2 °F (USCG, 1999) |
| Boiling Point | 258.1 °F at 760 mmHg (USCG, 1999) |
| Density | 0.703 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Molecular Weight | 114.23 |
| Solubility | 7e-05 % at 77 °F (NIOSH, 2024) |
| Appearance | N-octane is a colorless liquid with an odor of gasoline. Less dense than water and insoluble in water. Hence floats on water. Produces irritating vapor. |
Uses & Applications
Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.
Safety Information
Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Term
Octane
Formula
C8H18
CAS Number
111-65-9
Molecular Weight
114.23
Category
Organic Compounds
Index
All "O" terms
Synonyms
n-octane; 111-65-9; Oktan; Oktanen; Ottani; DTXSID0026882; X1RV0B2FJV; NSC-9822; DTXCID406882; CHEBI:17590
Frequently Asked Questions
Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic.
Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.
Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.
The formula or notation for Octane is: C8H18
More "O" Terms
1-Octanol
C8H18O
o-Cresol
C7H8O
o-Xylene
C8H10
Octahedral
ML₆
Octane Number
Octanoic acid
C8H16O2
Octet Rule
Octet Rule
Oganesson
Og
Oil
Oleic acid
C18H34O2
Omeprazole
C17H19N3O3S
View all "O" terms →
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.