Eicosane

• Formula: C₂₀H₄₂
• Molecular weight: 282.5475
• IUPAC Standard InChI: InChI=1S/C20H42/c1-3-5-7-9-11-13-15-17-19-20-18-16-14-12-10-8-6-4-2/h3-20H2,1-2H3 Copy

  
• IUPAC Standard InChIKey: CBFCDTFDPHXCNY-UHFFFAOYSA-N Copy
• CAS Registry Number: 112-95-8
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Other names: n-Eicosane; n-Icosane; icosane
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Henry's Law data
• Options:
  • Switch to SI units

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• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of liquid

Constant pressure heat capacity of solid

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Reduced pressure boiling point

Enthalpy of vaporization

Enthalpy of sublimation

Enthalpy of fusion

Entropy of fusion

Temperature of phase transition

Enthalpy of phase transition

Entropy of phase transition

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

 +  =

By formula: H₂ + C₂₀H₄₀ = C₂₀H₄₂

IR Spectrum

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Gas Phase Spectrum

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Additional Data

Mass spectrum (electron ionization)

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

Gas Chromatography

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Lee's RI, non-polar column, temperature ramp

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Lee's RI, non-polar column, custom temperature program

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References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Prosen and Rossini, 1945
Prosen, E.J.; Rossini, F.D., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, J. Res. NBS, 1945, 263-267. [all data]

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Parks, G.S.; Huffman, H.M.; Thomas, S.B., Thermal data on organic compounds. VI. The heat capacities, entropies and free energies of some saturated, non-benzenoid hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1032-1041. [all data]

Hoehne, 1981
Hoehne, G.W.H., Transitions of n-alkanes above the melting point, Polym. Bull. (Berlin), 1981, 6, 41-46. [all data]

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CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

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Marsh, K.N., Recommended Reference Materials for the Realization of Physicochemical Properties, Blackwell Sci. Pub., Oxford, 1987. [all data]

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Parks, G.S.; Huffman, H.M.; Thomas, S.B., Thermal Data on Organic Compounds VI. The Heat Capacities, Entropies and Free Energies of Some Saturated, Non-Benzenoid Hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1032-41. [all data]

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Ambrose, D.; Tsonopoulos, C., Vapor-Liquid Critical Properties of Elements and Compounds. 2. Normal Alkenes, J. Chem. Eng. Data, 1995, 40, 531-546. [all data]

Nikitin, Pavlov, et al., 1994
Nikitin, E.D.; Pavlov, P.A.; Bessonova, N.V., Critical constants of n-alkanes with from 17 to 24 carbon atoms, J. Chem. Thermodyn., 1994, 26, 177-82. [all data]

Morawetz, 1972
Morawetz, Ernst, Correlation of sublimation enthalpies at 298.15 K with molecular structure for planar aromatic hydrocarbons, The Journal of Chemical Thermodynamics, 1972, 4, 3, 461-467, https://doi.org/10.1016/0021-9614(72)90030-4 . [all data]

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Aldrich Chemical Company Inc., Catalog Handbook of Fine Chemicals, Aldrich Chemical Company, Inc., Milwaukee WI, 1990, 1. [all data]

Razzouk, Naccoul, et al., 2009
Razzouk, Antonio; Naccoul, Ramy Abou; Mokbel, Ilham; Saab, Joseph; Jose, Jacques, Vapor and Sublimation Pressures of Three Normal Alkanes: C ₂₀ , C ₂₄ , and C ₂₈, J. Chem. Eng. Data, 2009, 54, 4, 1214-1219, https://doi.org/10.1021/je800534x . [all data]

Morgan and Kobayashi, 1994
Morgan, David L.; Kobayashi, Riki, Direct vapor pressure measurements of ten n-alkanes m the 10-C28 range, Fluid Phase Equilibria, 1994, 97, 211-242, https://doi.org/10.1016/0378-3812(94)85017-8 . [all data]

Piacente, Fontana, et al., 1994
Piacente, Vincenzo; Fontana, Danilo; Scardala, Paolo, Enthalpies of Vaporization of a Homologous Series of n-Alkanes Determined from Vapor Pressure Measurements, J. Chem. Eng. Data, 1994, 39, 2, 231-237, https://doi.org/10.1021/je00014a009 . [all data]

Piacente, Pompili, et al., 1991
Piacente, Vincenzo; Pompili, Tiziano; Scardala, Paolo; Ferro, Daniela, Temperature dependence of the vaporization enthalpies of n-alkanes from vapour-pressure measurements, The Journal of Chemical Thermodynamics, 1991, 23, 4, 379-396, https://doi.org/10.1016/S0021-9614(05)80092-8 . [all data]

Chirico, Nguyen, et al., 1989
Chirico, R.D.; Nguyen, A.; Steele, W.V.; Strube, M.M., Vapor pressure of n-alkanes revisited. New high-precision vapor pressure data on n-decane, n-eicosane, and n-octacosane, J. Chem. Eng. Data, 1989, 34, 149-156. [all data]

Sasse, Jose, et al., 1988
Sasse, Karim; Jose, Jacques; Merlin, Jean-Claude, A static apparatus for measurement of low vapor pressures. Experimental results on high molecular-weight hydrocarbons, Fluid Phase Equilibria, 1988, 42, 287-304, https://doi.org/10.1016/0378-3812(88)80065-7 . [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

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Macknick, A. Brian; Prausnitz, John M., Vapor pressures of high-molecular-weight hydrocarbons, J. Chem. Eng. Data, 1979, 24, 3, 175-178, https://doi.org/10.1021/je60082a012 . [all data]

Barbillon, Schuffenecker, et al., 1991
Barbillon, P.; Schuffenecker, L.; Dellacherie, J.; Balesdent, D.; Dirande, M., Variation d'enthalpie subie de 260 K a 340 K par les n-paraffines, comprises entrel'octadecane et l'hexacosane, J. Chim. Phys. Phys.-Chim. Biol., 1991, 88, 91-113. [all data]

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Kolesnikov, S.I.; Syunyaev, Z.I., Phase transitions in the melting and crystallization of n-C₁₈H₃₈ and n-C₂₀H₄₂, Zhur. Prikl. Khim. (Leningrad), 1985, 58(10), 2267-2271. [all data]

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Company, J.C., Measurement and interpretation of crystallization equilibriums of heavy paraffin and aromatic hydrocarbon solutions, Chem. Eng. Sci., 1973, 28, 318-323. [all data]

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Khimeche, Kamel; Boumrah, Yacine; Benziane, Mokhtar; Dahmani, Abdallah, Solid--liquid equilibria and purity determination for binary n-alkane+naphthalene systems, Thermochimica Acta, 2006, 444, 2, 166-172, https://doi.org/10.1016/j.tca.2006.03.011 . [all data]

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Genovese, A.; Amarasinghe, G.; Glewis, M.; Mainwaring, D.; Shanks, Robert A., Crystallisation, melting, recrystallisation and polymorphism of n-eicosane for application as a phase change material, Thermochimica Acta, 2006, 443, 2, 235-244, https://doi.org/10.1016/j.tca.2006.02.008 . [all data]

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Mondieig, D.; Rajabalee, F.; Metivaud, V.; Oonk, H.A.J.; Cuevas-Diarte, M.A., n -Alkane Binary Molecular Alloys, Chem. Mater., 2004, 16, 5, 786-798, https://doi.org/10.1021/cm031169p . [all data]

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Syunyaev, Z.I.; Tumanyan, B.P.; Kolesnikov, S.I.; Zhokhova, N.I., Some anomalies in melting points of binary mixtures of solid hydrocarbons, Zhur. Prikl. Khim. (Leningrad), 1984, 57, 666-669. [all data]

Ksiazczak, 1989
Ksiazczak, A., Vapour pressures of binary three phase (solid+liquid+vapour) mixtures III. Melting temperatures of the solid phases of n-eicosane, J. Chem. Thermodynam., 1989, 21, 789-792. [all data]

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Schaerer, A.A.; Busso, C.J.; Smith, A.E.; Skinner, L.B., Properties of pure normal alkanes in the C₁₇ to C₃₆ range, J. Am. Chem. Soc., 1955, 77, 2017-2019. [all data]

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Chen, P.H.; Keeran, W.S.; Van Ausdale, W.A.; Schindler, D.R.; Roberts, D.W., Application of Lee retention indices to the confirmation of tentatively identified compounds from GC/MS analysis of environmental samples, Technical paper, Analytical Services Division, Environmental ScienceEngineering, Inc, PO Box 1703, Gainesville, FL 32602, 2002, 11. [all data]

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Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References

• Symbols used in this document:
  

  Cp,liquid	Constant pressure heat capacity of liquid
  Cp,solid	Constant pressure heat capacity of solid
  Pc	Critical pressure
  S°solid,1 bar	Entropy of solid at standard conditions (1 bar)
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  Ttrs	Temperature of phase transition
  ΔHtrs	Enthalpy of phase transition
  ΔStrs	Entropy of phase transition
  ΔcH°liquid	Enthalpy of combustion of liquid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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