Isoprene
- Formula: C5H8
- Molecular weight: 68.1170
- IUPAC Standard InChIKey: RRHGJUQNOFWUDK-UHFFFAOYSA-N
- CAS Registry Number: 78-79-5
- 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: 1,3-Butadiene, 2-methyl-; β-Methylbivinyl; Isopentadiene; 2-Methyl-1,3-butadiene; 2-Methylbutadiene; CH2=C(CH3)CH=CH2; 2-Methylbuta-1,3-diene; 3-Methyl-1,3-butadiene; NSC 9237
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, 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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 18.09 ± 0.24 | kcal/mol | Cm | Fraser and Prosen, 1955 | ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°gas | -761.62 ± 0.23 | kcal/mol | Cm | Fraser and Prosen, 1955 | Corresponding ΔfHºgas = 18.10 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°gas | 75.229 | cal/mol*K | N/A | Messerly J.F., 1970 | GT |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
8.671 | 50. | Thermodynamics Research Center, 1997 | Values of S(T) and Cp(T) from other statistical mechanics calculation [ Compton D.A.C., 1977] are in close agreement with recommended ones.; GT |
11.41 | 100. | ||
14.57 | 150. | ||
17.88 | 200. | ||
22.86 | 273.15 | ||
24.543 | 298.15 | ||
24.668 | 300. | ||
30.973 | 400. | ||
36.367 | 500. | ||
40.877 | 600. | ||
44.682 | 700. | ||
47.94 | 800. | ||
50.74 | 900. | ||
53.18 | 1000. | ||
55.28 | 1100. | ||
57.10 | 1200. | ||
58.68 | 1300. | ||
60.04 | 1400. | ||
61.23 | 1500. |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, 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
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔcH°liquid | -754.83 ± 0.38 | kcal/mol | Ccb | Jessup, 1938 | Reanalyzed by Cox and Pilcher, 1970, Original value = -754.52 ± 0.38 kcal/mol; Corresponding ΔfHºliquid = 11.3 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 54.560 | cal/mol*K | N/A | Messerly, Todd, et al., 1970 | DH |
S°liquid | 54.78 | cal/mol*K | N/A | Warfield and Petree, 1965 | DH |
S°liquid | 54.80 | cal/mol*K | N/A | Bekkedahl and Wood, 1937 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
36.109 | 298.15 | Messerly, Todd, et al., 1970 | T = 12 to 320 K.; DH |
36.45 | 298.15 | Warfield and Petree, 1965 | T = 20 to 300 K. A reexamination of 37BEK/WOO.; DH |
36.47 | 298.2 | Bekkedahl and Wood, 1937 | T = 20 to 300 K.; DH |
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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 307. ± 2. | K | AVG | N/A | Average of 17 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 131. ± 20. | K | AVG | N/A | Average of 7 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 127.27 | K | N/A | Messerly, Todd, et al., 1970, 2 | Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 126.4 | K | N/A | Bekkedahl and Wood, 1937, 2 | Uncertainty assigned by TRC = 0.2 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 6.31 | kcal/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 6.40 ± 0.06 | kcal/mol | V | Rogers, 1971 | ALS |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
7.03 | 239. | A | Stephenson and Malanowski, 1987 | Based on data from 221. to 254. K.; AC |
6.76 | 269. | A | Stephenson and Malanowski, 1987 | Based on data from 254. to 316. K.; AC |
7.53 | 225. | IP | Osborn and Douslin, 1969 | Based on data from 216. to 235. K.; AC |
6.52 | 299. | MM | Forziati, Camin, et al., 1950 | Based on data from 290. to 308. K.; AC |
6.55 | 288. | N/A | Kuchinskaya, 1938 | Based on data from 258. to 318. K.; AC |
6.17 | 307.2 | V | Bekkedahl, Wood, et al., 1936 | ALS |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
215.6 to 234.92 | 4.08251 | 1108.151 | -35.731 | Osborn and Douslin, 1969 | Coefficents calculated by NIST from author's data. |
289.9 to 307. | 3.21015 | 706.92 | -87.046 | Gubkov, Fermor, et al., 1964 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.1770 | 127.27 | Messerly, Todd, et al., 1970 | DH |
1.154 | 126.4 | Warfield and Petree, 1965 | DH |
1.154 | 126.4 | Bekkedahl and Wood, 1937 | DH |
1.18 | 127.3 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
9.2481 | 127.27 | Messerly, Todd, et al., 1970 | DH |
9.132 | 126.4 | Warfield and Petree, 1965 | DH |
9.132 | 126.4 | Bekkedahl and Wood, 1937 | DH |
Henry's Law 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: Rolf Sander
Henry's Law constant (water solution)
kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
k°H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)
k°H (mol/(kg*bar)) | d(ln(kH))/d(1/T) (K) | Method | Reference | Comment |
---|---|---|---|---|
0.028 | M | N/A | missing citation also measured solubilities in salt solutions. | |
0.013 | Q | N/A | missing citation give several references for the Henry's law constants but don't assign them to specific species. | |
0.013 | L | N/A | ||
0.013 | V | N/A |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Ion clustering data, 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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
View reactions leading to C5H8+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 8.86 ± 0.02 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 197.5 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 190.6 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.85 ± 0.02 | PE | Bieri, Burger, et al., 1977 | LLK |
8.85 | EI | Lossing and Traeger, 1975 | LLK |
8.90 ± 0.10 | EI | Puttemans and Delvaux, 1973 | LLK |
8.89 | PE | Beez, Bieri, et al., 1973 | LLK |
8.845 ± 0.005 | PI | Watanabe, Nakayama, et al., 1962 | RDSH |
8.84 ± 0.01 | S | Price and Walsh, 1940 | RDSH |
8.85 | PE | Werstiuk, Clark, et al., 1990 | Vertical value; LL |
8.85 | PE | Masclet, Mouvier, et al., 1981 | Vertical value; LLK |
8.87 | PE | Worley, Webb, et al., 1979 | Vertical value; LLK |
9.04 | PE | Sustmann and Schubert, 1972 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C3H3+ | 14.55 ± 0.15 | C2H4+H | EI | Puttemans and Delvaux, 1973 | LLK |
C3H4+ | 12.39 ± 0.12 | C2H4 | EI | Puttemans and Delvaux, 1973 | LLK |
C3H5+ | 14.04 ± 0.10 | C2H2+H | EI | Puttemans and Delvaux, 1973 | LLK |
C3H6+ | 12.76 ± 0.10 | C2H2 | EI | Puttemans and Delvaux, 1973 | LLK |
C4H5+ | 11.44 | CH3 | EI | Lossing and Holmes, 1984 | LBLHLM |
C4H5+ | 11.93 ± 0.10 | CH3 | EI | Puttemans and Delvaux, 1973 | LLK |
C5H5+ | 13.9 | H2+H | EI | Harrison, Haynes, et al., 1965 | RDSH |
C5H7+ | 10.54 | H | EI | Lossing and Traeger, 1975 | LLK |
C5H7+ | 10.54 | H | EI | Holmes, 1974 | LLK |
C5H7+ | 10.93 ± 0.10 | H | EI | Puttemans and Delvaux, 1973 | LLK |
De-protonation reactions
C5H7- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 385.6 ± 5.1 | kcal/mol | G+TS | Bartmess and McIver Jr., 1979 | gas phase; Between H2O, MeOH. Acid: isoprene; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 379.0 ± 5.0 | kcal/mol | IMRB | Bartmess and McIver Jr., 1979 | gas phase; Between H2O, MeOH. Acid: isoprene; B |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, 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: Robert C. Dunbar
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
By formula: Ag+ + C5H8 = (Ag+ • C5H8)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 39.2 ± 4.5 | kcal/mol | RAK | Ho, Yang, et al., 1997 |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering 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 by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | NIST Mass Spectrometry Data Center, 1990. |
NIST MS number | 118709 |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, 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.
Fraser and Prosen, 1955
Fraser, F.M.; Prosen, E.J.,
Heats of combustion and isomerization of six pentadienes and spiropentane,
J. Res. NBS, 1955, 54, 143-148. [all data]
Messerly J.F., 1970
Messerly J.F.,
Chemical thermodynamic properties of the pentadienes. Third law studies,
J. Chem. Eng. Data, 1970, 15, 227-232. [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]
Compton D.A.C., 1977
Compton D.A.C.,
Conformations of conjugated hydrocarbons. Part 2. A spectroscopic and thermodynamic study of cis- and trans-penta-1,3-diene,
J. Chem. Soc. Perkin Trans. 2, 1977, 1311-1315. [all data]
Jessup, 1938
Jessup, R.S.,
Heat of combustion of isoprene,
J. Res. NBS, 1938, 20, 589-597. [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]
Messerly, Todd, et al., 1970
Messerly, J.F.; Todd, S.S.; Guthrie, G.B.,
Chemical thermodynamic properties of the pentadienes,
J. Chem. Eng. Data, 1970, 15, 227-232. [all data]
Warfield and Petree, 1965
Warfield, R.W.; Petree, M.C.,
Thermodynamic properties of natural rubber and isoprene,
Die Makromol. Chemie, 1965, 84, 1-8. [all data]
Bekkedahl and Wood, 1937
Bekkedahl, N.; Wood, L.A.,
Entropy of isoprene from heat-capacity measurements,
J. Res. NBS, 1937, 19, 551-558. [all data]
Messerly, Todd, et al., 1970, 2
Messerly, J.F.; Todd, S.S.; Guthrie, G.B.,
Chemical thermodynamic properties of the pentadienes. Third law studies.,
J. Chem. Eng. Data, 1970, 15, 227-32. [all data]
Bekkedahl and Wood, 1937, 2
Bekkedahl, N.; Wood, L.A.,
Entropy of isoprene from heat-capacity measurements.,
J. Res. Natl. Bur. Stand. (U. S.), 1937, 19, 551. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Rogers, 1971
Rogers, F.E.,
Thermochemistry of the Diels-Alder reaction. I. Enthalpy of addition of isoprene to tetracyanoethylene,
J. Phys. Chem., 1971, 75, 1734-1737. [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]
Osborn and Douslin, 1969
Osborn, Ann G.; Douslin, Donald R.,
Vapor pressure relations for the seven pentadienes,
J. Chem. Eng. Data, 1969, 14, 2, 208-209, https://doi.org/10.1021/je60041a010
. [all data]
Forziati, Camin, et al., 1950
Forziati, A.F.; Camin, D.L.; Rossini, F.D.,
Density, refractive index, boiling point, and vapor pressure of eight monoolefin (1-alkene), six pentadiene, and two cyclomonoolefin hydrocarbons,
J. RES. NATL. BUR. STAN., 1950, 45, 5, 406, https://doi.org/10.6028/jres.045.044
. [all data]
Kuchinskaya, 1938
Kuchinskaya, K.,
Vapor pressures of pure substances,
Sbornik Trudov Opytnogo Zavoda im. Akad. S. V. Lebedeva, 1938, 27-30. [all data]
Bekkedahl, Wood, et al., 1936
Bekkedahl, N.; Wood, L.A.; Wojciechowski, M.,
Some physical properties of isoprene,
J. Res. NBS, 1936, 17, 883-894. [all data]
Gubkov, Fermor, et al., 1964
Gubkov, A.N.; Fermor, N.A.; Smirnov, N.I.,
Vapor Pressure of Mono-Poly Systems,
Zh. Prikl. Khim. (Leningrad), 1964, 37, 2204-2210. [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]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P.,
Valence ionization enrgies of hydrocarbons,
Helv. Chim. Acta, 1977, 60, 2213. [all data]
Lossing and Traeger, 1975
Lossing, F.P.; Traeger, J.C.,
Stabilization in cyclopentadienyl, cyclopentenyl, and cyclopentyl cations,
J. Am. Chem. Soc., 1975, 97, 1579. [all data]
Puttemans and Delvaux, 1973
Puttemans, J.-P.; Delvaux, J.C.,
Ionisation et fragmentation d'isomeres C5H8 sous impact electronique. Spiropentane - methylenecyclobutane - isoprene,
Ing. Chim. Brussell, 1973, 55(267-8), 7. [all data]
Beez, Bieri, et al., 1973
Beez, M.; Bieri, G.; Bock, H.; Heilbronner, E.,
The ionization potentials of butadiene, hexatriene, andtheir methyl derivatives: evidence for through space interaction between double bond π-orbitals and non-bonded pseudo-π orbitals of methyl groups?,
Helv. Chim. Acta, 1973, 56, 1028. [all data]
Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J.,
Ionization potentials of some molecules,
J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]
Price and Walsh, 1940
Price, W.C.; Walsh, A.D.,
The absorption spectra of conjugated dienes in the vacuum ultra-violet (1),
Proc. Roy. Soc. (London), 1940, A174, 220. [all data]
Werstiuk, Clark, et al., 1990
Werstiuk, N.H.; Clark, K.B.; Leigh, W.J.,
Conformational analysis and structure elucidation of 2,3-dimethyl and 2,4-dimethyl-2,4-hexadienes by AM1 and He(I) ultraviolet photoelectron spectroscopy,
Can. J. Chem., 1990, 68, 2078. [all data]
Masclet, Mouvier, et al., 1981
Masclet, P.; Mouvier, G.; Bocquet, J.F.,
Effets electroniques et effets steriques dus a la substitution alcoyle dans les dienes conjugues,
J. Chim. Phys., 1981, 78, 99. [all data]
Worley, Webb, et al., 1979
Worley, S.D.; Webb, T.R.; Gibson, D.H.; Ong, T.-S.,
On the electronic structures of cyclobutadiene trimethylenemethane,
J. Organomet. Chem., 1979, 168, 16. [all data]
Sustmann and Schubert, 1972
Sustmann, R.; Schubert, R.,
Photoelektronenspektroskopische bestimmung von substituenten-effekten. I. Subtituierte butadiene,
Tetrahedron Lett., 1972, 27, 2739. [all data]
Lossing and Holmes, 1984
Lossing, F.P.; Holmes, J.L.,
Stabilization energy and ion size in carbocations in the gas phase,
J. Am. Chem. Soc., 1984, 106, 6917. [all data]
Harrison, Haynes, et al., 1965
Harrison, A.G.; Haynes, P.; McLean, S.; Meyer, F.,
The mass spectra of methyl-substituted cyclopentadienes,
J. Am. Chem. Soc., 1965, 87, 5099. [all data]
Holmes, 1974
Holmes, J.L.,
The mass spectra of isomeric hydrocarbons - II: The C5H8 isomers, spiropentane, cyclopentene, 1,3-pentadiene and isoprene; the mechanisms and energetics of their fragmentations,
Org. Mass Spectrom., 1974, 8, 247. [all data]
Bartmess and McIver Jr., 1979
Bartmess, J.E.; McIver Jr.,
The Gas Phase Acidity Scale
in Gas Phase Ion Chemistry, Gas Phase Ion Chemistry, V. 2, M.T. Bowers, Ed., Academic Press, NY, 1979, Ch. 11, Elsevier, 1979. [all data]
Ho, Yang, et al., 1997
Ho, Y.-P.; Yang, Y.-C.; Klippenstein, S.J.; Dunbar, R.C.,
Binding Energies of Ag+ and Cd+ Complexes from Analysis of Radiative Association Kinetics,
J. Phys. Chem. A, 1997, 101, 18, 3338, https://doi.org/10.1021/jp9637284
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References
- Symbols used in this document:
AE Appearance energy Cp,gas Constant pressure heat capacity of gas Cp,liquid Constant pressure heat capacity of liquid IE (evaluated) Recommended ionization energy S°gas Entropy of gas at standard conditions S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature d(ln(kH))/d(1/T) Temperature dependence parameter for Henry's Law constant k°H Henry's Law constant at 298.15K ΔcH°gas Enthalpy of combustion of gas at standard conditions ΔcH°liquid Enthalpy of combustion of liquid 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 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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