1-Butyne
- Formula: C4H6
- Molecular weight: 54.0904
- IUPAC Standard InChIKey: KDKYADYSIPSCCQ-UHFFFAOYSA-N
- CAS Registry Number: 107-00-6
- 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: Butyne-1; Ethylacetylene; Ethylethyne; C2H5C≡CH; Ethyl acetylene, inhibited; UN 2452; but-1-yne
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
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Gas 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
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 165.2 ± 0.88 | kJ/mol | Cm | Prosen, Maron, et al., 1951 | ALS |
ΔfH°gas | 166.1 ± 2.1 | kJ/mol | Ccb | Wagman, Kilpatrick, et al., 1945 | Unpublished work of E. J. Prosen; ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°gas | -2596.8 ± 0.84 | kJ/mol | Cm | Prosen, Maron, et al., 1951 | Corresponding ΔfHºgas = 165.2 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
Constant pressure heat capacity of gas
Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
34.92 | 50. | Thermodynamics Research Center, 1997 | p=1 bar. Values from earlier statistical thermodynamics calculation [ Wagman D.D., 1945] are slightly lower than recommended ones (up to 1.8 J/mol*K in S(T) and 1 J/mol*K in Cp(T)).; GT |
43.77 | 100. | ||
52.95 | 150. | ||
62.46 | 200. | ||
76.90 | 273.15 | ||
81.82 | 298.15 | ||
82.18 | 300. | ||
100.68 | 400. | ||
116.59 | 500. | ||
130.02 | 600. | ||
141.49 | 700. | ||
151.41 | 800. | ||
160.04 | 900. | ||
167.57 | 1000. | ||
174.14 | 1100. | ||
179.87 | 1200. | ||
184.9 | 1300. | ||
189.2 | 1400. | ||
193.0 | 1500. |
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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
S°liquid | 197.48 | J/mol*K | N/A | Aston, Mastrangelo, et al., 1950 |
Constant pressure heat capacity of liquid
Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
132.42 | 280. | Aston, Mastrangelo, et al., 1950 | T = 13 to 280 K. |
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 | 283. ± 7. | K | AVG | N/A | Average of 21 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 147.28 | K | N/A | Pomerantz, Fookson, et al., 1954 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 147.39 | K | N/A | Boord, Greenlee, et al., 1947 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 147.49 | K | N/A | Boord, Greenlee, et al., 1947 | Uncertainty assigned by TRC = 0.3 K; TRC |
Tfus | 147.49 | K | N/A | Boord, Greenlee, et al., 1946 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 150.65 | K | N/A | Morehouse and Maass, 1931 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 147.45 | K | N/A | Aston, Mastrangelo, et al., 1950, 2 | Uncertainty assigned by TRC = 0.08 K; TRC |
Ttriple | 147.41 | K | N/A | Aston, Mastrangelo, et al., 1950, 2 | Uncertainty assigned by TRC = 0.06 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 440. ± 2. | K | N/A | Tsonopoulos and Ambrose, 1996 | |
Tc | 463.6 | K | N/A | Majer and Svoboda, 1985 | |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 46.0 ± 2.0 | bar | N/A | Tsonopoulos and Ambrose, 1996 | |
Quantity | Value | Units | Method | Reference | Comment |
Vc | 0.208 | l/mol | N/A | Tsonopoulos and Ambrose, 1996 | |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 4.8 ± 0.20 | mol/l | N/A | Tsonopoulos and Ambrose, 1996 | |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 23.79 | kJ/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 23.7 | kJ/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 23.38 | kJ/mol | V | Aston, Mastrangelo, et al., 1950 | ALS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
24.522 | 281.23 | N/A | Aston, Mastrangelo, et al., 1950 | P = 101.325 kPa; DH |
24.52 | 281.2 | N/A | Majer and Svoboda, 1985 | |
26. | 274. | A | Stephenson and Malanowski, 1987 | Based on data from 205. to 289. K.; AC |
25.8 ± 0.1 | 263. | C | Aston, Mastrangelo, et al., 1950 | AC |
24.5 ± 0.1 | 281. | C | Aston, Mastrangelo, et al., 1950 | AC |
Enthalpy of vaporization
ΔvapH =
A exp(-βTr) (1 − Tr)β
ΔvapH =
Enthalpy of vaporization (at saturation pressure)
(kJ/mol)
Tr = reduced temperature (T / Tc)
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Temperature (K) | A (kJ/mol) | β | Tc (K) | Reference | Comment |
---|---|---|---|---|---|
263. to 283. | 43.04 | 0.3654 | 463.6 | Majer and Svoboda, 1985 |
Entropy of vaporization
ΔvapS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
87.20 | 281.23 | Aston, Mastrangelo, et al., 1950 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
194.39 to 282.70 | 4.2402 | 1046.879 | -33.951 | Aston, Mastrangelo, et al., 1950 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
6.0291 | 147.43 | Aston, Mastrangelo, et al., 1950 | DH |
6.03 | 147.4 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
40.89 | 147.43 | Aston, Mastrangelo, et al., 1950 | 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 |
---|---|---|---|---|
0.054 | Q | N/A | missing citation give several references for the Henry's law constants but don't assign them to specific species. | |
0.053 | L | N/A | ||
0.076 | 1900. | L | N/A | |
0.054 | V | N/A |
Gas phase ion energetics 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 evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
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 C4H6+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 10.18 ± 0.01 | eV | N/A | N/A | L |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
10.20 ± 0.02 | PE | Bieri, Burger, et al., 1977 | LLK |
10.178 ± 0.005 | PE | Carlier, Dubois, et al., 1975 | LLK |
10.18 | EI | Lossing, 1972 | LLK |
10.18 | S | Nakayama and Watanabe, 1964 | RDSH |
10.18 ± 0.01 | PI | Watanabe and Namioka, 1956 | RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
CH3+ | 15.1 | C3H3 | EI | SenSharma and Franklin, 1973 | LLK |
C2H5+ | 12.9 ± 0.1 | C2H | EI | Coats and Anderson, 1957 | RDSH |
C3H+ | 12.59 | ? | EI | Field, Franklin, et al., 1957 | RDSH |
C3H3+ | 11.7 | CH3 | EI | SenSharma and Franklin, 1973 | LLK |
C3H3+ | 10.84 | CH3 | EI | Lossing, 1972 | LLK |
C4H+ | 13.20 | 2H2+H | EI | Field, Franklin, et al., 1957 | RDSH |
C4H3+ | 14.6 ± 0.2 | H2+H | EI | Coats and Anderson, 1957 | RDSH |
C4H4+ | 10.9 ± 0.2 | H2 | EI | Coats and Anderson, 1957 | RDSH |
C4H5+ | 10.85 | H | EI | Lossing and Holmes, 1984 | LBLHLM |
C4H5+ | 11.6 ± 0.1 | H | EI | Coats and Anderson, 1957 | RDSH |
IR Spectrum
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Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
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
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. |
---|---|
NIST MS number | 97 |
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
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Capillary | CP Sil 5 CB | 20. | 414. | Do and Raulin, 1992 | 25. m/0.15 mm/2. μm, H2 |
Packed | Squalane | 27. | 385. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 49. | 385. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 67. | 385. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 86. | 385. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 26. | 420. | Zulaïca and Guiochon, 1966 | Column length: 10. m |
Kovats' RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 424. | Hoekman, 1993 | 60. m/0.32 mm/1.0 μm, He; Program: -40 C for 12 min; -40 - 125 C at 3 deg.min; 125-185 C at 6 deg/min; 185 - 220 C at 20 deg/min; hold 220 C for 2 min |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Petrocol DH | 408. | White, Hackett, et al., 1992 | 100. m/0.25 mm/0.5 μm, He, 1. K/min; Tstart: 30. C; Tend: 220. C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Polydimethyl siloxane: CP-Sil 5 CB | 417. | Bramston-Cook, 2013 | 60. m/0.25 mm/1.0 μm, Helium, 45. C @ 1.45 min, 3.6 K/min, 210. C @ 2.72 min |
Capillary | OV-101 | 416. | Zenkevich, 2005 | 25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Methyl Silicone | 385. | Chen and Feng, 2007 | Program: not specified |
Capillary | Methyl Silicone | 385. | N/A | Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Prosen, Maron, et al., 1951
Prosen, E.J.; Maron, F.W.; Rossini, F.D.,
Heats of combustion, formation, and insomerization of ten C4 hydrocarbons,
J. Res. NBS, 1951, 46, 106-112. [all data]
Wagman, Kilpatrick, et al., 1945
Wagman, D.D.; Kilpatrick, J.E.; Pitzer, K.S.; Rossini, F.D.,
Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes, to 1,500° K,
J. Res. NBS, 1945, 35, 467-496. [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]
Wagman D.D., 1945
Wagman D.D.,
Heats, equilibrium constants, and free energies of formation of the acetylene hydrocarbons through the pentynes to 1500 K,
J. Res. Nat. Bur. Stand., 1945, 35, 467-496. [all data]
Aston, Mastrangelo, et al., 1950
Aston, J.G.; Mastrangelo, S.V.R.; Moessen, G.W.,
The thermodynamics of 1-butyne from calorimetric and spectroscopic data,
J. Am. Chem. Soc., 1950, 72, 5287-5291. [all data]
Pomerantz, Fookson, et al., 1954
Pomerantz, P.; Fookson, A.; Mears, T.W.; Rothberg, S.; Howard, F.L.,
Synthesis and Physical Properties of Several Acetylenic Hydrocarbons,
J. Res. Natl. Bur. Stand. (U. S.), 1954, 52, 51. [all data]
Boord, Greenlee, et al., 1947
Boord, C.E.; Greenlee, K.W.; Perilstein, W.L.; Derfer, J.M.,
The Synthesis, Purification and Prop. of Hydrocarbons of Low Mol. Wt., Am. Pet. Inst. Res. Proj. 45, Ninth Annu. Rep., Ohio State Univ., June 30, 1947. [all data]
Boord, Greenlee, et al., 1946
Boord, C.E.; Greenlee, K.W.; Perilstein, W.L.,
The Synthesis, Purification and Prop. of Hydrocarbons of Low Mol. Weight, Am. Pet. Inst. Res. Proj. 45, Eighth Annu. Rep., Ohio State Univ., June 30, 1946. [all data]
Morehouse and Maass, 1931
Morehouse, F.R.; Maass, O.,
The Preparationa and Physical Properties of Ethyl and Methyl Acetylene,
Can. J. Res., 1931, 5, 306. [all data]
Aston, Mastrangelo, et al., 1950, 2
Aston, J.G.; Mastrangelo, S.V.R.; Moessen, G.W.,
The Thermodynamics of 1-Butyne from Calorimetric and Spectroscopic Data. Data,
J. Am. Chem. Soc., 1950, 72, 5287. [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]
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]
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]
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]
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]
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]
Carlier, Dubois, et al., 1975
Carlier, P.; Dubois, J.E.; Masclet, P.; Mouvier, G.,
Spectres de photoelectrons des alcynes,
J. Electron Spectrosc. Relat. Phenom., 1975, 7, 55. [all data]
Lossing, 1972
Lossing, F.P.,
Free radicals by mass spectrometry. XLV. Ionization potentials and heats of formation of C3H3, C3H5, and C4H7 radicals and ions,
Can. J. Chem., 1972, 50, 3973. [all data]
Nakayama and Watanabe, 1964
Nakayama, T.; Watanabe, K.,
Absorption and photoionization coefficients of acetylene, propyne, and 1-butyne,
J. Chem. Phys., 1964, 40, 558. [all data]
Watanabe and Namioka, 1956
Watanabe, K.; Namioka, T.,
Ionization potential of propyne,
J. Chem. Phys., 1956, 24, 915. [all data]
SenSharma and Franklin, 1973
SenSharma, D.K.; Franklin, J.L.,
Heat of formation of free radicals by mass spectrometry,
J. Am. Chem. Soc., 1973, 95, 6562. [all data]
Coats and Anderson, 1957
Coats, F.H.; Anderson, R.C.,
Thermodynamic data from electron-impact measurements on acetylene and substituted acetylenes,
J. Am. Chem. Soc., 1957, 79, 1340. [all data]
Field, Franklin, et al., 1957
Field, F.H.; Franklin, J.L.; Lampe, F.W.,
Reactions of gaseous ions. II. Acetylene,
J. Am. Chem. Soc., 1957, 79, 2665. [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]
Do and Raulin, 1992
Do, L.; Raulin, F.,
Gas chromatography of Titan's atmosphere. III. Analysis of low-molecular-weight hydrocarbons and nitriles with a CP-Sil-5 CB WCOT capillary column,
J. Chromatogr., 1992, 591, 1-2, 297-301, https://doi.org/10.1016/0021-9673(92)80247-R
. [all data]
Hively and Hinton, 1968
Hively, R.A.; Hinton, R.E.,
Variation of the retention index with temperature on squalane substrates,
J. Gas Chromatogr., 1968, 6, 4, 203-217, https://doi.org/10.1093/chromsci/6.4.203
. [all data]
Zulaïca and Guiochon, 1966
Zulaïca, J.; Guiochon, G.,
Analyse des hauts polymères par chromatographie en phase gazeuse de leurs produits de pyrolyse. II. Application à quelques hydrocarbures macromoléculaires purs,
Bull. Soc. Chim. Fr., 1966, 4, 1351-1363. [all data]
Hoekman, 1993
Hoekman, S.K.,
Improved gas chromatography procedure for speciated hydrocarbon measurements of vehicle emissions,
J. Chromatogr., 1993, 639, 2, 239-253, https://doi.org/10.1016/0021-9673(93)80260-F
. [all data]
White, Hackett, et al., 1992
White, C.M.; Hackett, J.; Anderson, R.R.; Kail, S.; Spock, P.S.,
Linear temperature programmed retention indices of gasoline range hydrocarbons and chlorinated hydrocarbons on cross-linked polydimethylsiloxane,
J. Hi. Res. Chromatogr., 1992, 15, 2, 105-120, https://doi.org/10.1002/jhrc.1240150211
. [all data]
Bramston-Cook, 2013
Bramston-Cook, R.,
Kovats indices for C2-C13 hydrocarbons and selected oxygenated/halocarbons with 100 % dimethylpolysiloxane columns, 2013, retrieved from http://lotusinstruments.com/monographs/List .... [all data]
Zenkevich, 2005
Zenkevich, I.G.,
Experimentally measured retention indices., 2005. [all data]
Chen and Feng, 2007
Chen, Y.; Feng, C.,
QSPR study on gas chromatography retention index of some organic pollutants,
Comput. Appl. Chem. (China), 2007, 24, 10, 1404-1408. [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, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, 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 Pc Critical pressure S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature Vc Critical volume 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 ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion 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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