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3-Ethylpentane (C7H16) is a branched, saturated hydrocarbon. It is an alkane, and one of the many structural isomers of heptane, consisting of a five carbon chain with a two carbon branch at the middle carbon.

Skeletal formula of 3-ethylpentane
Ball and stick model of 3-ethylpentane
Spacefill model of 3-ethylpentane
IUPAC name
3D model (JSmol)
ECHA InfoCard 100.009.573
EC Number 210-529-0
Molar mass 100.205 g·mol−1
Appearance Colourless liquid
Odor Odourless
Density 693.77 mg mL−1
Melting point −119.0 to −118.5 °C; −182.1 to −181.4 °F; 154.2 to 154.6 K
Boiling point 93.3 to 93.7 °C; 199.8 to 200.6 °F; 366.4 to 366.8 K
3.9 nmol Pa−1 kg−1
219.58 J K−1 mol−1
314.55 J K−1 mol−1
−226.2–−223.8 kJ mol−1
−4.8174–−4.8152 MJ mol−1
Highly Flammable F Harmful Xn Dangerous for the Environment (Nature) N
R-phrases (outdated) R11, R38, R65, R67, R50/53
S-phrases (outdated) (S2), S16, S29, S33,  
Related compounds
Related alkanes
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

An example of an alcohol derived from 3-ethylpentane is the tertiary alcohol 3-ethylpentan-3-ol.[2]


  1. ^ "3-ETHYLPENTANE - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification and Related Records. Retrieved 5 March 2012.
  2. ^ Ritchie, R and Gent, D: OCR Chemistry AS, page 151. Heinemann, 2007.