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Properties of substance:

n-heptane



skc-file

Synonyms:

heptane

Group of substances:

organic

Physical appearance:

colorless liquid

Empirical formula (Hill's system for organic substances):

C7H16

Structural formula as text:

CH3(CH2)5CH3

Molar/atomic mass: 100.202

Melting point (°C):

-90.601

Boiling point (°C):

98.427

CAS №: 142-82-5

Solubility (g/100 g of solvent):

chloroform: soluble [Ref.]
diethyl ether: miscible [Ref.]
diethylene glycol: 0.545 (11°C) [Ref.]
ethanol: 126.6 (20°C) [Ref.]
ethanol 92%: 39.9 (15°C) [Ref.]
methanol: 22.3 (5°C) [Ref.]
methanol: 25 (10°C) [Ref.]
methanol: 28.1 (15°C) [Ref.]
methanol: 32.1 (20°C) [Ref.]
methanol: 36.3 (25°C) [Ref.]
methanol: 41.9 (30°C) [Ref.]
methanol: 48.5 (35°C) [Ref.]
methanol: 58.4 (40°C) [Ref.]
methanol: miscible (51.2°C) [Ref.]
triethylene glycol: very slightly soluble [Ref.]
water: 0.000242 (25°C) [Ref.]
water: 0.000341 (50°C) [Ref.]
water: 0.00057 (75°C) [Ref.]
water: 0.00108 (100°C) [Ref.]
water: 0.00946 (170°C, with pressure 7 bar) [Ref.]

Density:

0.7731 (-90°C, g/cm3)
0.7653 (-80°C, g/cm3)
0.7574 (-70°C, g/cm3)
0.7495 (-60°C, g/cm3)
0.7415 (-50°C, g/cm3)
0.7335 (-40°C, g/cm3)
0.7254 (-30°C, g/cm3)
0.7172 (-20°C, g/cm3)
0.709 (-10°C, g/cm3)
0.7005 (0°C, g/cm3)
0.692 (10°C, g/cm3)
0.68376 (20°C, d4)
0.6836 (20°C, g/cm3)
0.69763 (25°C, d4)
0.6751 (30°C, g/cm3)
0.6665 (40°C, g/cm3)
0.6579 (50°C, g/cm3)
0.6491 (60°C, g/cm3)
0.6402 (70°C, g/cm3)
0.6311 (80°C, g/cm3)
0.6218 (90°C, g/cm3)

Reactions:

  1. [Ref.1]
    NOCl + CH3(CH2)5CH3 → (CH3CH2CH2)2C=NOH + HCl

Refractive index (nD):

1.38764 (20°C)

Vapour pressure (Torr):

0.0075 (-78.6°C)
0.075 (-60.2°C)
0.75 (-37°C)
1 (-33°C)
7.5 (-6.6°C)
10 (-2°C)
40 (22.4°C)
75 (35.4°C)
100 (41.8°C)
400 (78°C)
750 (98°C)

Permittivity (dielectric constant):

1.924 (20°C)

Viscosity (mPa·s):

0.414 (20°C)
0.526 (0°C)

Flash point (°C):

-4

Autoignition temperature (°C):

223

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-224.2 (l) [Ref.]
-187.6 (g) [Ref.]

Molar heat capacity at constant pressure Cp (298 K, J/(mol·K))

224.7 (l) [Ref.]

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 8-103
  2. Journal of Chemical and Engineering Data. - 1961. - Vol. 6, No. 3. - pp. 339
  3. Deanesly, R. M.; Carleton, L. T. Physical Constants of the Normal Paraffin Hydrocarbons. / Journal of Physical Chemistry. - 1941. - Vol. 45, No. 7. - pp. 1104-1123 [DOI: 10.1021/j150412a006]
  4. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 562-563, 566
  5. Smallwood I.M. Handbook of organic solvent properties. - 1996. - pp. 11-13
  6. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 434-435
  7. Воскресенский П.И., Каверина А.А., Парменов К.Я., Цветков Л.А., Эпштейн Д.А. Справочник по химии. - 4 изд. - М.: Просвещение, 1978. - pp. 200 [Russian]
  8. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1226 [Russian]
  9. Справочник химика. - 2 изд., Т.1. - Л.-М.: Химия, 1966. - pp. 643 [Russian]
  10. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 596-597 [Russian]
  11. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 127 [Russian]
  12. Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 340 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru