Ethane, hexafluoro-

• Formula: C₂F₆
• Molecular weight: 138.0118
• IUPAC Standard InChI: InChI=1S/C2F6/c3-1(4,5)2(6,7)8 Copy

  
• IUPAC Standard InChIKey: WMIYKQLTONQJES-UHFFFAOYSA-N Copy
• CAS Registry Number: 76-16-4
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: Perfluoroethane; F-116; Freon 116; Hexafluoroethane; C2F6; Fluorocarbon 116; UN 2193; Freon 1166SY; 1,1,1,2,2,2-Hexafluoroethane; R 116; Ethane, 1,1,1,2,2,2-hexafluoro-; HFC 116
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• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Vibrational and/or electronic energy levels
  • Gas Chromatography
  • Fluid Properties
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes

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

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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View table.

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 by: Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of liquid

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
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis

Enthalpy of vaporization

Enthalpy of vaporization

Δ_vapH = A exp(-βT_r) (1 − T_r)^β
    Δ_vapH = Enthalpy of vaporization (at saturation pressure) (kcal/mol)
    T_r = reduced temperature (T / T_c)

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Entropy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Enthalpy of sublimation

Enthalpy of fusion

Entropy of fusion

Enthalpy of phase transition

Entropy of phase transition

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes

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

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Walker, Sinke, et al., 1970
Walker, L.C.; Sinke, G.C.; Perettie, D.J.; Janz, G.J., Enthalpy of formation of trifluoroacetonitrile, J. Am. Chem. Soc., 1970, 92, 4525-4526. [all data]

Coomber and Whittle, 1967
Coomber, J.W.; Whittle, E., Bond dissociation energies from equilibrium studies. Part 2.-D(CF₃-CF₃) and enthalpy of formation of C₂F₆, Trans. Faraday Soc., 1967, 63, 1394-1401. [all data]

Sinke, 1966
Sinke, G.C., The heat of reaction of nitrogen trifluoride and hexafluoroethane, J. Phys. Chem., 1966, 70, 1326-1327. [all data]

Kirkbride and Davidson, 1954
Kirkbride, F.W.; Davidson, F.G., Heats of formation of gaseous fluoro- and fluorochloro-carbons, Nature (London), 1954, 174, 79-80. [all data]

Kolesov and Papina, 1983
Kolesov, V.P.; Papina, T.S., Thermochemistry of Haloethanes, Russ. Chem. Rev., 1983, 52, 425. [all data]

Pace and Aston, 1948
Pace, E.L.; Aston, J.G., The thermodynamics of hexafluoroethane from calorimetric and spectroscopic data, J. Am. Chem. Soc., 1948, 70, 566-570. [all data]

Thorp and Scott, 1956
Thorp, N.; Scott, R.L., Fluorocarbon solutions at low termperatures. I. The liquid mixtures CF4-CHF3, CF4-CH4, CF4-Kr, CH4-Kr., J. Phys. Chem., 1956, 60, 670. [all data]

Ruff and Bretschneider, 1933
Ruff, O.; Bretschneider, O., The Preparation of Hexafluoroethane and Tetrafluoroethene from Tetrafluoromethane, Z. Anorg. Allg. Chem., 1933, 210, 173. [all data]

Swarts, 1933
Swarts, F., Hexafluoroethane., Bull. Soc. Chim. Belg., 1933, 42, 114. [all data]

Lobo and Staveley, 1979
Lobo, L.Q.; Staveley, L.A.K., The vapour pressure of tetrafluoromethane., Cryogenics, 1979, 19, 335. [all data]

Pace and Aston, 1948, 2
Pace, E.L.; Aston, J.G., The thermodynamics of hexafluoroethane from calorimetric and spectroscopic data, J. Am. Chem. Soc., 1948, 70, 566. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Saikawa, Kijima, et al., 1979
Saikawa, K.; Kijima, J.; Uematsu, M.; Watanabe, K., Determination of the critical temperature and density of hexafluoroethane, J. Chem. Eng. Data, 1979, 24, 165-7. [all data]

Kijima, Saikawa, et al., 1977
Kijima, J.; Saikawa, K.; Watanabe, K.; Oguchi, K.; Tanishita, I., Experimental study of thermodyn. prop. of hexafluoroethane (R116) in Proc. Symp. Thermophys. Prop., 7th, Cezairliyan, A., Ed., ASME: New York, p 480, 1977. [all data]

Kim, 1974
Kim, K.Y., Calorimetric studies on argon and Hexafluoroethane and a generalized correlation of maxima in isobaric heat capacity., Ph.D. Dissertation, Univ. Mich., Ann Arbour, MI, 1974. [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]

Bondi, 1963
Bondi, A., Heat of Siblimation of Molecular Crystals: A Catalog of Molecular Structure Increments., J. Chem. Eng. Data, 1963, 8, 3, 371-381, https://doi.org/10.1021/je60018a027 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References

• Symbols used in this document:
  

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

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