Heptane

Heptane is an organic compound with the chemical formula C₇H₁₆. It is an alkane with seven carbon atoms. It is used in fuels and is in gasoline.

Heptane
IUPAC name	Heptane
Other names	Septane
Identifiers
CAS number	142-82-5
PubChem	8900
EC number	205-563-8
MeSH	n-heptane
ChEBI	CHEBI:43098
RTECS number	MI7700000
SMILES	CCCCCCC
Beilstein Reference	1730763
Gmelin Reference	49760
Properties
Molecular formula	C7H16
Molar mass	100.2 g mol-1
Appearance	Colourless liquid
Odor	Petrolic
Density	0.6795 g cm−3
Melting point	-90.549 °C,  K,  °F
Boiling point
Solubility in water	0.0003% (20 °C)
log P	4.274
Vapor pressure	5.33 kPa (at 20.0 °C)
kH	12 nmol Pa−1 kg−1
Magnetic susceptibility (χ)	-85.24·10−6 cm3/mol
Refractive index (nD)	1.3855
Viscosity	0.386 mPa·s
Dipole moment	0.0 D
Thermochemistry
Std enthalpy of formation ΔfHo298	−225.2–−223.6 kJ mol−1
Std enthalpy of combustion ΔcHo298	−4.825–−4.809 MJ mol−1
Standard molar entropy So298	328.57 J K−1 mol−1
Specific heat capacity, C	224.64 J K−1 mol−1
Hazards
NFPA 704	3 1 0
Explosive limits	1.05–6.7%
U.S. Permissible exposure limit (PEL)	TWA 500 ppm (2000 mg/m3)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)