Ethylene

Formula: C₂H₄
Molecular weight: 28.0532
IUPAC Standard InChI: InChI=1S/C2H4/c1-2/h1-2H2
IUPAC Standard InChIKey: VGGSQFUCUMXWEO-UHFFFAOYSA-N
CAS Registry Number: 74-85-1
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:
- (Z)-Ethylene-1,2-d2
Other names: Ethene; Acetene; Bicarburretted hydrogen; Elayl; Olefiant gas; C2H4; Athylen; Liquid ethyene; UN 1038; UN 1962
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Information on this page:
Other data available:
- Condensed phase thermochemistry data
- Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 54
- Ion clustering data
- IR Spectrum
- Mass spectrum (electron ionization)
- UV/Visible spectrum
- Vibrational and/or electronic energy levels
- Gas Chromatography
- Fluid Properties
Data at other public NIST sites:
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Gas phase thermochemistry data

Go To: Top, Phase change data, Henry's Law data, Gas phase ion energetics data, References, Notes

Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
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
Δ_fH°_gas	52.47	kJ/mol	Review	Chase, 1998	Data last reviewed in September, 1965
Δ_fH°_gas	52.4 ± 0.5	kJ/mol	Review	Manion, 2002	adopted recommendation of Gurvich, Veyts, et al., 1991; DRB
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_gas	-1411.20 ± 0.30	kJ/mol	Cm	Rossini and Knowlton, 1937	Reanalyzed by Cox and Pilcher, 1970, Original value = -1410.97 ± 0.30 kJ/mol; Corresponding Δ_fHº_gas = 52.52 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	219.32	J/mol*K	Review	Chase, 1998	Data last reviewed in September, 1965

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
33.26	50.	Thermodynamics Research Center, 1997	p=1 bar. Recommended entropies and heat capacities are in good agreement with those obtained from other statistical thermodynamics calculations [ Chao J., 1975, Gurvich, Veyts, et al., 1989] as well as with ab initio value of S(298.15 K)=219.14 J/mol*K [ East A.L.L., 1997].; GT
33.27	100.
33.66	150.
35.37	200.
40.60	273.15
42.90	298.15
43.08	300.
53.06	400.
62.48	500.
70.66	600.
77.70	700.
83.82	800.
89.18	900.
93.88	1000.
98.00	1100.
101.61	1200.
104.76	1300.
107.53	1400.
109.96	1500.
114.81	1750.
118.37	2000.
121.03	2250.
123.06	2500.
124.62	2750.
125.86	3000.

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
34.66 ± 0.26	178.15	Burcik E.J., 1941	Other experimental values of heat capacity [ Haas M.E., 1932] are less accurate, see [ Chao J., 1975]. Please also see Eucken A., 1933.; GT
35.30 ± 0.26	192.35
36.29 ± 0.27	210.40
37.55 ± 0.28	230.90
39.02 ± 0.29	250.60
40.75 ± 0.02	270.7
41.02 ± 0.31	271.80
42.84 ± 0.32	293.45
43.47 ± 0.17	300.0
45.98 ± 0.04	320.7
49.74 ± 0.37	367.7
59.25 ± 0.44	463.6

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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.

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View table.

Temperature (K)	298. to 1200.	1200. to 6000.
A	-6.387880	106.5104
B	184.4019	13.73260
C	-112.9718	-2.628481
D	28.49593	0.174595
E	0.315540	-26.14469
F	48.17332	-35.36237
G	163.1568	275.0424
H	52.46694	52.46694
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in September, 1965	Data last reviewed in September, 1965

Phase change data

Go To: Top, Gas phase thermochemistry data, Henry's Law data, Gas phase ion energetics data, References, Notes

Data compiled as indicated in comments:
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

Quantity	Value	Units	Method	Reference	Comment
T_boil	169. ± 1.	K	AVG	N/A	Average of 9 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_fus	103.8	K	N/A	Streng, 1971	Uncertainty assigned by TRC = 0.2 K; TRC
T_fus	103.7	K	N/A	Kistiakowsky, Romeyn, et al., 1935	Uncertainty assigned by TRC = 0.5 K; TRC
T_fus	103.7	K	N/A	Parks and Huffman, 1931	Uncertainty assigned by TRC = 1. K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_triple	104.0 ± 0.1	K	AVG	N/A	Average of 9 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
P_triple	0.0012	bar	N/A	Jahangiri, Jacobsen, et al., 1986	Uncertainty assigned by TRC = 0.00005 bar; TRC
P_triple	0.0012	bar	N/A	Jahangiri, 1984	TRC
Quantity	Value	Units	Method	Reference	Comment
T_c	282.5 ± 0.5	K	AVG	N/A	Average of 10 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
P_c	50.6 ± 0.5	bar	AVG	N/A	Average of 10 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
V_c	0.1311	l/mol	N/A	Tsonopoulos and Ambrose, 1996
V_c	0.13099	l/mol	N/A	Jahangiri, 1984	Uncertainty assigned by TRC = 0.00002 l/mol; TRC
V_c	0.13098	l/mol	N/A	Douslin and Harrison, 1976	Uncertainty assigned by TRC = 0.0001 l/mol; TRC
V_c	0.12868	l/mol	N/A	Angus, Armstrong, et al., 1974	Uncertainty assigned by TRC = 0.0001 l/mol; TRC
Quantity	Value	Units	Method	Reference	Comment
ρ_c	7.63 ± 0.004	mol/l	N/A	Tsonopoulos and Ambrose, 1996
ρ_c	7.6334	mol/l	N/A	Jahangiri, Jacobsen, et al., 1986	Uncertainty assigned by TRC = 0.004 mol/l; TRC
ρ_c	7.6341	mol/l	N/A	Hastings, Levelt Sengers, et al., 1980	Uncertainty assigned by TRC = 0.0007 mol/l; PVT, Burnett apparatus, Unct. value one standard deviation from fitting.; TRC
ρ_c	18.894	mol/l	N/A	Angus, Armstrong, et al., 1974	Uncertainty assigned by TRC = 0.007 mol/l; TRC
ρ_c	7.6986	mol/l	N/A	Mathias, Crommelin, et al., 1929	Uncertainty assigned by TRC = 0.02 mol/l; TRC

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
13.544	169.40	N/A	Egan and Kemp, 1937	DH
14.0	267.	A	Stephenson and Malanowski, 1987	Based on data from 252. to 282. K.; AC
13.7	258.	A	Stephenson and Malanowski, 1987	Based on data from 170. to 273. K.; AC
14.4	155.	A	Stephenson and Malanowski, 1987	Based on data from 120. to 170. K.; AC
13.7	196.	A	Stephenson and Malanowski, 1987	Based on data from 169. to 211. K.; AC
13.6	239.	A	Stephenson and Malanowski, 1987	Based on data from 209. to 254. K.; AC
14.1	167.	A	Stephenson and Malanowski, 1987	Based on data from 120. to 182. K. See also Dykyj, 1970.; AC
14.0	175.	N/A	Michels and Wassenaar, 1950	Based on data from 150. to 190. K.; AC
14.3	161.	N/A	Lamb and Roper, 1940	Based on data from 148. to 174. K.; AC
14.4	156.	N/A	Egan and Kemp, 1937	Based on data from 124. to 171. K.; AC

Entropy of vaporization

Δ_vapS (J/mol*K)	Temperature (K)	Reference	Comment
79.95	169.40	Egan and Kemp, 1937	DH

Antoine Equation Parameters

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

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Temperature (K)	A	B	C	Reference	Comment
149.37 to 188.57	3.87261	584.146	-18.307	Michels and Wassenaar, 1950	Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

Δ_subH (kJ/mol)	Temperature (K)	Method	Reference	Comment
18.4	91.5	A,MS	Stephenson and Malanowski, 1987	Based on data from 79. to 104. K. See also Tickner and Lossing, 1951.; AC
15.0	77. to 103.	N/A	Menaucourt, 1982	AC

Enthalpy of fusion

Δ_fusH (kJ/mol)	Temperature (K)	Reference	Comment
3.351	103.97	Chao, Hall, et al., 1983	DH
3.351	103.95	Egan and Kemp, 1937	DH
3.35	104.	Domalski and Hearing, 1996	AC

Entropy of fusion

Δ_fusS (J/mol*K)	Temperature (K)	Reference	Comment
32.23	103.97	Chao, Hall, et al., 1983	DH
32.23	103.95	Egan and Kemp, 1937	DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Henry's Law data

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Data compiled by: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/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(k_H))/d(1/T) = Temperature dependence constant (K)

k°_H (mol/(kg*bar))	d(ln(k_H))/d(1/T) (K)	Method	Reference	Comment
0.0048		Q	N/A	missing citation give several references for the Henry's law constants but don't assign them to specific species.
0.0049		Q	N/A	Several references are given in the list of Henry's law constants but not assigned to specific species.
0.0047		L	N/A
0.0047	1800.	L	N/A
0.0047		V	N/A
0.0049		X	N/A	The value is taken from the compilation of solubilities by W. Asman (unpublished).

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, References, Notes

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
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C₂H₄⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	10.5138 ± 0.0006	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	680.5	kJ/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	651.5	kJ/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_{(+) ion}	1067. ± 0.8	kJ/mol	N/A	N/A
Quantity	Value	Units	Method	Reference	Comment
Δ_fH_{(+) ion,0K}	1080.	kJ/mol	N/A	N/A

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.51	CI	Ohno, Okamura, et al., 1995	LL
10.5138 ± 0.0006	LS	Williams and Cool, 1991	LL
10.51 ± 0.015	EI	Plessis and Marmet, 1986	LBLHLM
10.509 ± 0.005	EVAL	Plessis and Marmet, 1986	LBLHLM
10.51	PE	Kimura, Katsumata, et al., 1981	LLK
10.50 ± 0.02	PI	Wood and Taylor, 1979	LLK
10.514 ± 0.007	PE	Carlier and Botter, 1979	LLK
10.51	PE	Sell, Mintz, et al., 1978	LLK
10.51 ± 0.02	PE	Bieri, Burger, et al., 1977	LLK
~10.5	EI	Van Veen, 1976	LLK
10.517 ± 0.002	TE	Stockbauer and Inghram, 1975	LLK
10.517 ± 0.003	TE	Stockbauer and Inghram, 1975, 2	LLK
10.51	PI	Rabalais, Debies, et al., 1974	LLK
10.5	EI	Maeda, Suzuki, et al., 1974	LLK
10.507 ± 0.004	PI	Knowles and Nicholson, 1974	LLK
10.51 ± 0.01	EI	Gordon, Krige, et al., 1974	LLK
10.515 ± 0.003	PE	Masclet, Grosjean, et al., 1973	LLK
10.51	PE	Beez, Bieri, et al., 1973	LLK
10.51	PE	Mason, Kuppermann, et al., 1972	LLK
10.51	PE	Brundle, Robin, et al., 1972	LLK
10.56	PE	Frost and Sandhu, 1971	LLK
10.51 ± 0.02	PE	Branton, Frost, et al., 1970	RDSH
10.51 ± 0.05	PE	Eland, 1969	RDSH
10.50 ± 0.05	EI	Williams and Hamill, 1968	RDSH
10.51	PE	Baker, Baker, et al., 1968	RDSH
10.511 ± 0.005	PI	Brehm, 1966	RDSH
10.50 ± 0.01	PI	Botter, Dibeler, et al., 1966	RDSH
10.507 ± 0.004	PI	Nicholson, 1965	RDSH
10.50 ± 0.02	PI	Momigny, 1963	RDSH
10.52 ± 0.01	PI	Watanabe, 1954	RDSH
10.51 ± 0.03	S	Price and Tutte, 1940	RDSH
10.80 ± 0.05	EI	Kusch, Hustrulid, et al., 1937	RDSH
10.68	PE	Bieri and Asbrink, 1980	Vertical value; LLK
10.50 ± 0.01	PE	Krause, Taylor, et al., 1978	Vertical value; LLK
10.5	PE	Kobayashi, 1978	Vertical value; LLK
10.5	PE	White, Carlson, et al., 1974	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
C⁺	≤18.30 ± 0.16	CH₄	EI	Plessis and Marmet, 1986	LBLHLM
C⁺	24.4	?	EI	Maeda, Suzuki, et al., 1974	LLK
C⁺	24.6 ± 0.5	?	EI	Kusch, Hustrulid, et al., 1937	RDSH
CH⁺	17.68 ± 0.16	CH₃	EI	Plessis and Marmet, 1986	LBLHLM
CH⁺	22.1	?	EI	Maeda, Suzuki, et al., 1974	LLK
CH⁺	22.9 ± 0.5	?	EI	Kusch, Hustrulid, et al., 1937	RDSH
CH₂⁺	17.82 ± 0.06	CH₂	EI	Plessis and Marmet, 1986	LBLHLM
CH₂⁺	18.04 ± 0.04	CH₂	TE	Stockbauer and Inghram, 1975, 2	LLK
CH₂⁺	18.4	CH₂	EI	Maeda, Suzuki, et al., 1974	LLK
CH₂⁺	18.05	CH₂	PI	Chupka, Berkowitz, et al., 1969	RDSH
CH₂⁺	19.2 ± 0.3	?	EI	Kusch, Hustrulid, et al., 1937	RDSH
CH₃⁺	15.60 ± 0.20	CH^-	EI	Plessis and Marmet, 1986	LBLHLM
CH₃⁺	16.95 ± 0.15	CH	EI	Plessis and Marmet, 1986	LBLHLM
CH₃⁺	19.3	?	EI	Maeda, Suzuki, et al., 1974	LLK
CH₄⁺	18.66	C^-	EI	Plessis and Marmet, 1986	LBLHLM
C₂⁺	24.5	?	EI	Maeda, Suzuki, et al., 1974	LLK
C₂⁺	26.4 ± 1.0	2H+H₂	EI	Kusch, Hustrulid, et al., 1937	RDSH
C₂H⁺	18.7	H+H₂	EI	Maeda, Suzuki, et al., 1974	LLK
C₂H⁺	19.2 ± 1.0	H+H₂	EI	Kusch, Hustrulid, et al., 1937	RDSH
C₂H₂⁺	13.14 ± 0.03	H₂	EI	Plessis and Marmet, 1986	LBLHLM
C₂H₂⁺	13.2 ± 0.1	H₂	PIPECO	Bombach, Dannacher, et al., 1984	T = 0K; LBLHLM
C₂H₂⁺	13.55	H₂	PI	Wood and Taylor, 1979	LLK
C₂H₂⁺	13.13 ± 0.04	H₂	EI	Gordon, Harvey, et al., 1977	LLK
C₂H₂⁺	13.0 ± 0.1	H₂	EI	Gordon, Harvey, et al., 1977	LLK
C₂H₂⁺	13.14 ± 0.01	H₂	TE	Stockbauer and Inghram, 1975, 2	LLK
C₂H₂⁺	13.1	H₂	EI	Maeda, Suzuki, et al., 1974	LLK
C₂H₂⁺	13.11 ± 0.02	H₂	EI	Gordon, Krige, et al., 1974	LLK
C₂H₂⁺	13.13 ± 0.02	H₂	PI	Chupka, Berkowitz, et al., 1969	RDSH
C₂H₂⁺	12.96 ± 0.02	H₂	PI	Brehm, 1966	RDSH
C₂H₂⁺	13.12 ± 0.03	H₂	PI	Botter, Dibeler, et al., 1966	RDSH
C₂H₂⁺	13.4 ± 0.2	H₂	EI	Kusch, Hustrulid, et al., 1937	RDSH
C₂H₃⁺	12.35 ± 0.10	H^-	EI	Plessis and Marmet, 1986	LBLHLM
C₂H₃⁺	13.10 ± 0.08	H	EI	Plessis and Marmet, 1986	LBLHLM
C₂H₃⁺	13.3 ± 0.1	H	PIPECO	Bombach, Dannacher, et al., 1984	T = 0K; LBLHLM
C₂H₃⁺	13.55	H	PI	Wood and Taylor, 1979	LLK
C₂H₃⁺	13.22 ± 0.02	H	TE	Stockbauer and Inghram, 1975, 2	LLK
C₂H₃⁺	13.6	H	EI	Maeda, Suzuki, et al., 1974	LLK
C₂H₃⁺	13.31 ± 0.03	H	EI	Gordon, Krige, et al., 1974	LLK
C₂H₃⁺	13.52 ± 0.04	H	EI	Finney and Harrison, 1972	LLK
C₂H₃⁺	13.25 ± 0.05	H	PI	Chupka, Berkowitz, et al., 1969	RDSH
C₂H₃⁺	13.37 ± 0.03	H	PI	Brehm, 1966	RDSH
C₂H₃⁺	14.1 ± 0.1	H	EI	Kusch, Hustrulid, et al., 1937	RDSH
H⁺	18.66 ± 0.05	C₂H₃	C2H3	Shiromaru, Achiba, et al., 1987	LBLHLM
H⁺	26.2 ± 1.5	C₂H₃	EI	Kusch, Hustrulid, et al., 1937	RDSH
H₂⁺	22.4 ± 1.5	?	EI	Kusch, Hustrulid, et al., 1937	RDSH

De-protonation reactions

C₂H₃^- + = Ethylene

By formula: C₂H₃^- + H⁺ = C₂H₄

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1704. ± 9.	kJ/mol	AVG	N/A	Average of 5 out of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1677.8 ± 2.1	kJ/mol	IMRE	Ervin, Gronert, et al., 1990	gas phase; B
Δ_rG°	1670. ± 8.8	kJ/mol	H-TS	DePuy, Gronert, et al., 1989	gas phase; B
Δ_rG°	1668. ± 21.	kJ/mol	H-TS	Peerboom, Rademaker, et al., 1992	gas phase; B
Δ_rG°	>1661.0	kJ/mol	IMRB	Froelicher, Freiser, et al., 1986	gas phase; B

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Notes

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

Manion, 2002
Manion, J.A., Evaluated Enthalpies of Formation of the Stable Closed Shell C1 and C2 Chlorinated Hydrocarbons, J. Phys. Chem. Ref. Data, 2002, 31, 1, 123-172, https://doi.org/10.1063/1.1420703 . [all data]

Gurvich, Veyts, et al., 1991
Thermodynamic Properties of Individual Substances, 4th edition, Volume 2, Gurvich, L.V.; Veyts, I.V.; Alcock, C.B.;, ed(s)., Hemisphere, New York, 1991. [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]

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

Gurvich, Veyts, et al., 1989
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B., Thermodynamic Properties of Individual Substances, 4th ed.; Vols. 1 and 2, Hemisphere, New York, 1989. [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]

Burcik E.J., 1941
Burcik E.J., The vibrational energy levels and specific heat of ethylene, J. Chem. Phys., 1941, 9, 118-119. [all data]

Haas M.E., 1932
Haas M.E., The heat capacity and free energy of formation of ethylene gas, J. Phys. Chem., 1932, 36, 2127-2132. [all data]

Eucken A., 1933
Eucken A., Molar heats and normal frequencies of ethane and ethylene, Z. Phys. Chem., 1933, B20, 184-194. [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]

Kistiakowsky, Romeyn, et al., 1935
Kistiakowsky, G.B.; Romeyn, H.; Ruhoff, J.R.; Smith, H.A.; Vaughan, W.E., Heats of Organic Reactions. I. The Apparatus and the Heat of Hydrogenation of Ethylene, J. Am. Chem. Soc., 1935, 57, 65. [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]

Jahangiri, Jacobsen, et al., 1986
Jahangiri, M.; Jacobsen, R.T.; Stewart, R.B.; McCarty, R.D., Thermodynamic Properties of Ethylene from the Freezing Line to 450 K at Pressures to 260 MPa, J. Phys. Chem. Ref. Data, 1986, 15, 593. [all data]

Jahangiri, 1984
Jahangiri, M., A thermodynamic property formulation for ethylene from the freezing line to 450 K at pressures to 260 MPa, Ph.D. Thesis, Univ. Idaho, Moscow, 1984. [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]

Douslin and Harrison, 1976
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Notes

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Symbols used in this document:

AE	Appearance energy
C_p,gas	Constant pressure heat capacity of gas
IE (evaluated)	Recommended ionization energy
P_c	Critical pressure
P_triple	Triple point pressure
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
T_boil	Boiling point
T_c	Critical temperature
T_fus	Fusion (melting) point
T_triple	Triple point temperature
V_c	Critical volume
d(ln(k_H))/d(1/T)	Temperature dependence parameter for Henry's Law constant
k°_H	Henry's Law constant at 298.15K
Δ_cH°_gas	Enthalpy of combustion of gas at standard conditions
Δ_fH_{(+) ion,0K}	Enthalpy of formation of positive ion at 0K
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_fusH	Enthalpy of fusion
Δ_fusS	Entropy of fusion
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_subH	Enthalpy of sublimation
Δ_vapH	Enthalpy of vaporization
Δ_vapS	Entropy of vaporization
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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