Structural Formula Vector Image
Title: n-Heptane
CAS Registry Number: 142-82-5
Molecular Formula: C7H16
Molecular Weight: 100.20
Percent Composition: C 83.91%, H 16.09%
Line Formula: CH3(CH2)5CH3
Literature References: A hydrocarbon from petroleum. Toxicity data: Lazarew, Arch. Exp. Pathol. Pharmakol. 143, 223 (1929).
Properties: Volatile, flammable liquid. d420 0.684. bp 98.4°. mp -90.7°. Flash pt, open cup: 30°F (-1°C); closed cup: 25°F (-4°C). nD25 1.3855. Insol in water. Sol in alcohol, chloroform, ether. LC (2 hr in air) in mice: 75 mg/l (Lazarew).
Melting point: mp -90.7°
Boiling point: bp 98.4°
Flash point: Flash pt, open cup: 30°F (-1°C); closed cup: 25°F (-4°C)
Index of refraction: nD25 1.3855
Density: d420 0.684
Toxicity data: LC (2 hr in air) in mice: 75 mg/l (Lazarew)
CAUTION: Potential symptoms of overexposure are lightheadedness, giddiness, stupor, vertigo, incoordination; loss of appetite, nausea; unconsciousness. Direct contact may cause dermatitis; aspiration of liquid may cause chemical pneumonia. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 156.
Use: As standard in testing knock of gasoline engines.

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