Propene

• Formula: C₃H₆
• Molecular weight: 42.0797
• IUPAC Standard InChI: InChI=1S/C3H6/c1-3-2/h3H,1H2,2H3 Copy

  
• IUPAC Standard InChIKey: QQONPFPTGQHPMA-UHFFFAOYSA-N Copy
• CAS Registry Number: 115-07-1
• 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.
• Isotopologues:
  • Propene-d6
• Other names: Propylene; 1-Propene; Methylethylene; 1-Propylene; CH3CH=CH2; Methylethene; NCI-C50077; UN 1077; R 1270
• 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)
  • References
  • Notes
• Other data available:
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • Gas Chromatography
  • Fluid Properties
• Data at other public NIST sites:
  • Microwave spectra (on physics lab web site)
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
• Options:
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• NIST / TRC Web Thermo Tables, "lite" edition (thermophysical and thermochemical data)
• 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), 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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), 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: Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of liquid

Phase change data

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

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

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

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Enthalpy of fusion

Entropy of fusion

Temperature of phase transition

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), 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:
B - John E. Bartmess
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar

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

C₃H₅^- +  =

By formula: C₃H₅^- + H⁺ = C₃H₆

 +  =

By formula: HBr + C₃H₆ = C₃H₇Br

 +  =

By formula: C₃H₆ + H₂ = C₃H₈

C₃H₅^- +  =

By formula: C₃H₅^- + H⁺ = C₃H₆

 +  =  + 

By formula: HI + C₃H₅I = C₃H₆ + I₂

=  + 

By formula: C₃H₇Cl = C₃H₆ + HCl

 +  = ( • )

By formula: Co⁺ + C₃H₆ = (Co⁺ • C₃H₆)

Enthalpy of reaction

C₃H₉Si⁺ +  = (C₃H₉Si⁺ • )

By formula: C₃H₉Si⁺ + C₃H₆ = (C₃H₉Si⁺ • C₃H₆)

 +  =

By formula: C₃H₆ + Br₂ = C₃H₆Br₂

C₃H₅^- +  =

By formula: C₃H₅^- + H⁺ = C₃H₆

 +  = ( • )

By formula: Li⁺ + C₃H₆ = (Li⁺ • C₃H₆)

Rh⁺ +  = (Rh⁺ • )

By formula: Rh⁺ + C₃H₆ = (Rh⁺ • C₃H₆)

Enthalpy of reaction

 +  = ( • )

By formula: Fe⁺ + C₃H₆ = (Fe⁺ • C₃H₆)

Enthalpy of reaction

(CAS Reg. No. 25012-80-0 • 4294967295) +  = CAS Reg. No. 25012-80-0

By formula: (CAS Reg. No. 25012-80-0 • 4294967295C₃H₆) + C₃H₆ = CAS Reg. No. 25012-80-0

(CAS Reg. No. 59513-13-2 • 4294967295) +  = CAS Reg. No. 59513-13-2

By formula: (CAS Reg. No. 59513-13-2 • 4294967295C₃H₆) + C₃H₆ = CAS Reg. No. 59513-13-2

 +  =

By formula: C₃H₆ + HCl = C₃H₇Cl

 +  =

By formula: HI + C₃H₆ = C₃H₇I

 +  =

By formula: C₃H₆ + H₂O₄S = isopropyl hydrogen sulphate

=  + 

By formula: C₃H₆I₂ = C₃H₆ + I₂

=  + 

By formula: C₃H₇Br = HBr + C₃H₆

 +  =

By formula: C₃H₆ + C₃F₆O = C₆H₆F₆O

 +  = ( • )

By formula: Au⁺ + C₃H₆ = (Au⁺ • C₃H₆)

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• GAS (150 mmHg, N2 ADDED, TOTAL PRESSURE 600 mmHg); DOW KBr FOREPRISM-GRATING; DIGITIZED BY COBLENTZ SOCIETY (BATCH II) FROM HARD COPY; 2 cm^-1 resolution

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

• gas

Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, 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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

References

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

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

Furuyama, Golden, et al., 1969
Furuyama, S.; Golden, D.M.; Benson, S.W., Thermochemistry of the gas phase equilibria i-C₃H₇I = C₃H₆ + HI, n-C₃H₇I = i-C₃H₇I, and C₃H₆ + 2HI = C₃H₈ + I₂, J. Chem. Thermodyn., 1969, 1, 363-375. [all data]

Lacher, Walden, et al., 1950
Lacher, J.R.; Walden, C.H.; Lea, K.R.; Park, J.D., Vapor phase heats of hydrobromination of cyclopropane and propylene, J. Am. Chem. Soc., 1950, 72, 331-333. [all data]

Wiberg and Fenoglio, 1968
Wiberg, K.B.; Fenoglio, R.A., Heats of formation of C₄H₆ hydrocarbons, J. Am. Chem. Soc., 1968, 90, 3395-3397. [all data]

Rossini and Knowlton, 1937
Rossini, F.d.; Knowlton, J.W., Calorimetric determination of the heats of combustion of ethylene and propylene, J. Res. NBS, 1937, 19, 249-262. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Thermodynamics Research Center, 1997
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]

Crawford B.L., 1939
Crawford B.L., Jr., The entropy and heat capacity of propylene, J. Am. Chem. Soc., 1939, 61, 2980-2981. [all data]

Kilpatrick J.E., 1946
Kilpatrick J.E., Heat content, free energy function, entropy, and heat capacity of ethylene, propylene, and the four butenes to 1500 K, J. Res. Nat. Bur. Stand, 1946, 37, 163-171. [all data]

Kilpatrick J.E., 1947
Kilpatrick J.E., Normal coordinate analysis of the vibrational frequencies of ethylene, propylene, cis-2-butene, trans-2-butene, and isobutene, J. Res. Nat. Bur. Stand., 1947, 38, 191-209. [all data]

Chao J., 1975
Chao J., Ideal gas thermodynamic properties of ethylene and propylene, J. Phys. Chem. Ref. Data, 1975, 4, 251-261. [all data]

East A.L.L., 1997
East A.L.L., Ab initio statistical thermodynamical models for the computation of third-law entropies, J. Chem. Phys., 1997, 106, 6655-6674. [all data]

Bier K., 1974
Bier K., Thermodynamic properties of propylene from calorimetric measurements, J. Chem. Thermodyn., 1974, 6, 1039-1052. [all data]

Kistiakowsky G.B., 1940
Kistiakowsky G.B., The low temperature gaseous heat capacities of certain C3 hydrocarbons, J. Chem. Phys., 1940, 8, 970-977. [all data]

Kistiakowsky G.B., 1940, 2
Kistiakowsky G.B., Gaseous heat capacities. II, J. Chem. Phys., 1940, 8, 610-618. [all data]

Telfair D., 1942
Telfair D., Supersonic measurement of the heat capacity of propylene, J. Chem. Phys., 1942, 10, 167-171. [all data]

Chao, Hall, et al., 1983
Chao, J.; Hall, K.R.; Yao, J.M., Thermodynamic properties of simple alkenes, Thermochim. Acta, 1983, 64(3), 285-303. [all data]

Auerbach, Sage, et al., 1950
Auerbach, C.E.; Sage, B.H.; Lacey, W.N., Isobaric heat capacities at bubble point, Ind. Eng. Chem., 1950, 42, 110-113. [all data]

Powell and Giauque, 1939
Powell, T.M.; Giauque, W.F., Propylene. The heat capacity, vapor pressure, heats of fusion and vaporization. The third law of thermodynamics and orientation equilibrium in the solid, J. Am. Chem. Soc., 1939, 61, 2366-2370. [all data]

Huffman, Parks, et al., 1931
Huffman, H.M.; Parks, G.S.; Barmore, M., Thermal data on organic compounds. X. Further studies on the heat capacities, entropies and free energies of hydrocarbons, J. Am. Chem. Soc., 1931, 53, 3876-3888. [all data]

Streng, 1971
Streng, A.G., Miscibility and Compatibility of Some Liquid and Solidified Gases at Low Temperature, J. Chem. Eng. Data, 1971, 16, 357. [all data]

Haselden and Snowden, 1962
Haselden, G.G.; Snowden, P., Equilibrium Properties of the Carbon Dioxide+ Propylene and Carbon Dioxide + Cyclopropane Systems at Low Temperatures, Trans. Faraday Soc., 1962, 58, 1515-28. [all data]

Parks and Huffman, 1931
Parks, G.S.; Huffman, H.M., Some fusion and transition data for hydrocarbons, Ind. Eng. Chem., 1931, 23, 1138-9. [all data]

Coffin and Maass, 1927
Coffin, C.C.; Maass, O., The Prepartion and Physical Properties of Isobutylene, Trans. R. Soc. Can., Sect. 3, 1927, 21, 33. [all data]

Angus, Armstrong, et al., 1980
Angus, S.; Armstrong, B.; de Reuck, K.M., International Thermodynamic Tables of the Fluid State - 7 Propylene(Propene), Pergamon, New York, 1980. [all data]

Tsonopoulos and Ambrose, 1996
Tsonopoulos, C.; Ambrose, D., Vapor-Liquid Critical Properties of Elements and Compounds. 6. Unsaturated Aliphatic Hydrocarbons, J. Chem. Eng. Data, 1996, 41, 645-656. [all data]

Ohgaki, Umezono, et al., 1990
Ohgaki, K.; Umezono, S.; Katayama, T., Pressure-density-temperature (p-ρ-T) relations of fluoroform, nitrous oxide, and propene in the critical region, J. Supercrit. Fluids, 1990, 3, 78-84. [all data]

Marchman, Prengle, et al., 1949
Marchman, H.; Prengle, H.W.; Motard, R.L., Compressibility and Critical Constants of Propylene Vapor, Ind. Eng. Chem., 1949, 41, 2658. [all data]

Seibert and Burrell, 1915
Seibert, F.M.; Burrell, G.A., The Critical Constants of Normal Butane, Iso-butane and Propylene and Their Vapor Pressures at Temperatures Bewtween 0 deg.C and 120 deg.C, J. Am. Chem. Soc., 1915, 37, 2683-91. [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]

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]

Dykyj, 1970
Dykyj, J., Petrochemica, 1970, 10, 2, 51. [all data]

Michels, Wassenaar, et al., 1953
Michels, A.; Wassenaar, T.; Louwerse, P.; Lunbeck, R.J.; Wolkers, G.J., Isotherms and thermodynamical functions of propene at temperatures between 25° and 150°c and at densities up to 340 amagat (pressures up to 2800 atm), Physica, 1953, 19, 1-12, 287-297, https://doi.org/10.1016/S0031-8914(53)80030-3 . [all data]

Maass and Wright, 1921
Maass, O.; Wright, C.H., SOME PHYSICAL PROPERTIES OF HYDROCARBONS CONTAINING TWO AND THREE CARBON ATOMS., J. Am. Chem. Soc., 1921, 43, 5, 1098-1111, https://doi.org/10.1021/ja01438a013 . [all data]

Boublik, Fried, et al., 1984
Boublik, T.; Fried, V.; Hala, E., The Vapour Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapour Pressures of Some Pure Substances in the Normal and Low Pressure Region, 2nd ed., Elsevier, New York, 1984, 972. [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]

Takeda, Oguni, et al., 1990
Takeda, K.; Oguni, M.; Suga, H., A DTA apparatus for vapour-deposited samples. Characterisation of some vapour-deposited hydrocarbons, Thermochim. Acta, 1990, 158(1), 195-203. [all data]

Ellison, Davico, et al., 1996
Ellison, G.B.; Davico, G.E.; Bierbaum, V.M.; DePuy, C.H., Thermochemistry of theb Benzyl and Allyl Radicals and Ions, Int. J. Mass Spectrom. Ion Proc., 1996, 156, 1-2, 109-131, https://doi.org/10.1016/S0168-1176(96)04383-2 . [all data]

Wenthold, Polak, et al., 1996
Wenthold, P.G.; Polak, M.L.; Lineberger, W.C., Photoelectron Spectroscopy of the Allyl and 2-Methylallyl Anions, J. Phys. Chem., 1996, 100, 17, 6920, https://doi.org/10.1021/jp953401n . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Mackay, Lien, et al., 1978
Mackay, G.I.; Lien, M.H.; Hopkinson, A.C.; Bohme, D.K., Experimental and theoretical studies of proton removal from propene, Can. J. Chem., 1978, 56, 131. [all data]

Lacher, Kianpour, et al., 1957
Lacher, J.R.; Kianpour, A.; Park, J.D., Reaction heats of organic halogen compounds. X. Vapor phase heats of hydrobromination of cyclopropane and propylene, J. Phys. Chem., 1957, 61, 1124-1125. [all data]

Lacher, Lea, et al., 1950
Lacher, J.R.; Lea, K.R.; Walden, C.H.; Olson, G.G.; Park, J.D., Reaction heats of organic fluorine compounds. III. The vapor phase heats of hydrobromination of some simple fluoroolefins, J. Am. Chem. Soc., 1950, 72, 3231-3234. [all data]

Kistiakowsky and Nickle, 1951
Kistiakowsky, G.B.; Nickle, A.G., Ethane-ethylene and propane-propylene equilibria, Faraday Discuss. Chem. Soc., 1951, 10, 175-187. [all data]

Kistiakowsky, Ruhoff, et al., 1935
Kistiakowsky, G.B.; Ruhoff, J.R.; Smith, H.A.; Vaughan, W.E., Heats of organic reactions. II. Hydrogenation of some simpler olefinic hydrocarbons, J. Am. Chem. Soc., 1935, 57, 876-882. [all data]

DePuy, Gronert, et al., 1989
DePuy, C.H.; Gronert, S.; Barlow, S.E.; Bierbaum, V.M.; Damrauer, R., The Gas Phase Acidities of the Alkanes, J. Am. Chem. Soc., 1989, 111, 6, 1968, https://doi.org/10.1021/ja00188a003 . [all data]

Froelicher, Freiser, et al., 1986
Froelicher, S.W.; Freiser, B.S.; Squires, R.R., The C₃H₅^- isomers. Experimental and theoretical studies of the tautomeric propenyl ions and the cyclopropyl anion in the gas phase, J. Am. Chem. Soc., 1986, 108, 2853. [all data]

Rodgers, Golden, et al., 1966
Rodgers, A.S.; Golden, D.M.; Benson, S.W., The thermochemistry of the gas phase equilibrium I₂ + C₃H₆ = C₃H₅I + HI, J. Am. Chem. Soc., 1966, 88, 3194-3196. [all data]

Noren and Sunner, 1970
Noren, I.; Sunner, S., The enthalpy of formation of 2-chloropropane from equilibrium studies, J. Chem. Thermodyn., 1970, 2, 597-602. [all data]

Kabo and Andreevskii, 1963
Kabo, G.Ya.; Andreevskii, D.N., Equilibrium of 2-chloropropane dehydrochlorination, Neftekhimiya, 1963, 3, 764-770. [all data]

Howlett, 1955
Howlett, K.E., The use of equilibrium constants to calculate thermodynamic quantities. Part II, J. Chem. Soc., 1955, 1784-17. [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]

Haynes and Armentrout, 1994
Haynes, C.L.; Armentrout, P.B., Thermochemistry and Structures of CoC3H6+: Metallacyclic and Metal-Alkene Isomers, Organomettalics, 1994, 13, 9, 3480, https://doi.org/10.1021/om00021a022 . [all data]

Li and Stone, 1989
Li, X.; Stone, J.A., Determination of the beta silicon effect from a mass spectrometric study of the association of trimethylsilylium ion with alkenes, J. Am. Chem. Soc., 1989, 111, 15, 5586, https://doi.org/10.1021/ja00197a013 . [all data]

Conn, Kistiakowsky, et al., 1938
Conn, J.B.; Kistiakowsky, G.B.; Smith, E.A., Heats of organic reactions. VII. Addition of halogens to olefins, J. Am. Chem. Soc., 1938, 60, 2764-2771. [all data]

Staley and Beauchamp, 1975
Staley, R.H.; Beauchamp, J.L., Intrinsic Acid - Base Properties of Molecules. Binding Energies of Li+ to pi - and n - Donor Bases, J. Am. Chem. Soc., 1975, 97, 20, 5920, https://doi.org/10.1021/ja00853a050 . [all data]

Dzidic and Kebarle, 1970
Dzidic, I.; Kebarle, P., Hydration of the Alkali Ions in the Gas Phase. Enthalpies and Entropies of Reactions M+(H2O)n-1 + H2O = M+(H2O)n, J. Phys. Chem., 1970, 74, 7, 1466, https://doi.org/10.1021/j100702a013 . [all data]

Chen and Armetrout, 1995
Chen, Y.M.; Armetrout, P.B., Activation of C2H6, C3H8, and c-C3H6 by Gas-Phase Rh+ and the Thermochemistry of Rh-Ligand Complexes, J. Am. Chem. Soc., 1995, 117, 36, 9291, https://doi.org/10.1021/ja00141a022 . [all data]

Entelis, Korovina, et al., 1960
Entelis, S.G.; Korovina, G.V.; Chirkov, N.M., The thermodynamics of propylene absorption by the H₂SO₄-H₂0 system, Dokl. Akad. Nauk SSSR, 1960, 134, 856-859. [all data]

Benson and Amano, 1962
Benson, S.W.; Amano, A., Thermodynamics of iodine addition to ethylene, propylene, and cyclopropane, J. Chem. Phys., 1962, 36, 3464-3471. [all data]

Rozhnov and Andreevskii, 1962
Rozhnov, A.M.; Andreevskii, D.N., Equilibrium in the system propene, hydrogen bromide, bromopropane, Dokl. Akad. Nauk SSSR, 1962, 147, 388-391. [all data]

Moore, 1971
Moore, L.O., Kinetics and thermodynamic data for the hydrogen fluoride addition to vinyl fluoride, Can. J. Chem., 1971, 49, 2471-2475. [all data]

Schroeder, Hrusak, et al., 1995
Schroeder, D.; Hrusak, J.; Hertwig, R.H.; Koch, W.; Schwerdtfeger, P.; Schwarz, H., Experimental and Theoretical Studies of Gold(I) Complexes Au(L)+ (L=H2O, CO, NH3, C2H4, C3H6, C4H6, C6H6, C6F6), Organometallics, 1995, 14, 1, 312, https://doi.org/10.1021/om00001a045 . [all data]

Notes

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

• Symbols used in this document:
  

  Cp,gas	Constant pressure heat capacity of gas
  Cp,liquid	Constant pressure heat capacity of liquid
  Pc	Critical pressure
  Ptriple	Triple point pressure
  S°liquid	Entropy of liquid at standard conditions
  T	Temperature
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  Ttrs	Temperature of phase transition
  Vc	Critical volume
  ΔcH°gas	Enthalpy of combustion of gas at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions
  ΔvapS	Entropy of vaporization
  ρc	Critical density

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