Ethylene oxide

Formula: C₂H₄O
Molecular weight: 44.0526
IUPAC Standard InChI: InChI=1S/C2H4O/c1-2-3-1/h1-2H2
IUPAC Standard InChIKey: IAYPIBMASNFSPL-UHFFFAOYSA-N
CAS Registry Number: 75-21-8
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: Oxirane; Dihydrooxirene; Dimethylene oxide; Epoxyethane; Ethene oxide; ETO; Oxacyclopropane; Oxane; Oxidoethane; Oxirene, dihydro-; Oxyfume; Oxyfume 12; T-Gas; 1,2-Epoxyethane; Aethylenoxid; Amprolene; Anprolene; Anproline; ENT-26263; E.O.; 1,2-Epoxyaethan; Ethyleenoxide; Etylenu tlenek; FEMA No. 2433; Merpol; NCI-C50088; α,β-Oxidoethane; Oxiraan; Oxiran; Rcra waste number U115; Sterilizing gas ethylene oxide 100%; UN 1040; Qazi-ketcham
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Gas phase thermochemistry data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-52.64	kJ/mol	Review	Chase, 1998	Data last reviewed in September, 1965
Δ_fH°_gas	-52.63 ± 0.63	kJ/mol	Cm	Pell and Pilcher, 1965	ALS
Δ_fH°_gas	-70.2	kJ/mol	N/A	Moureu and Dode, 1937	Value computed using Δ_fH_liquid° value of -95.7±1.3 kj/mol from Moureu and Dode, 1937 and Δ_vapH° value of 25.51 kj/mol from missing citation.; DRB
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_gas	-1306.0 ± 0.59	kJ/mol	Cm	Pell and Pilcher, 1965	Corresponding Δ_fHº_gas = -52.63 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Δ_cH°_gas	-1307.7 ± 0.84	kJ/mol	Ccb	Crog and Hunt, 1942	Corresponding Δ_fHº_gas = -50.96 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	243.00	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.	Dorofeeva O.V., 1992	p=1 bar. Selected values are in good agreement with other statistically calculated values [ Godnev I., 1948, Gunthard H., 1948, Kobe K.A., 1950, Sundaram S., 1963, Ramasamy R., 1978, Chao J., 1986].; GT
33.28	100.
33.82	150.
36.19	200.
43.71	273.15
47.0 ± 1.0	298.15
47.29	300.
61.66	400.
74.89	500.
85.97	600.
95.14	700.
102.81	800.
109.32	900.
114.89	1000.
119.67	1100.
123.79	1200.
127.36	1300.
130.45	1400.
133.14	1500.

Constant pressure heat capacity of gas

C_p,gas (J/mol*K)	Temperature (K)	Reference	Comment
49.37	307.18	Kistiakowsky G.B., 1940	GT
53.51	337.04
58.41	371.23

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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Temperature (K)	298. to 1200.	1200. to 6000.
A	-23.25802	131.3483
B	275.6997	13.80594
C	-188.9729	-2.645062
D	51.03350	0.175820
E	0.386930	-30.03639
F	-55.09156	-158.3795
G	142.7777	313.4276
H	-52.63514	-52.63514
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in September, 1965	Data last reviewed in September, 1965

Condensed phase thermochemistry data

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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
Δ_fH°_liquid	-95.7 ± 1.3	kJ/mol	Ccb	Moureu and Dode, 1937	Reanalyzed by Cox and Pilcher, 1970, Original value = -95.4 kJ/mol; ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_liquid	-1262.9 ± 1.3	kJ/mol	Ccb	Moureu and Dode, 1937	Reanalyzed by Cox and Pilcher, 1970, Original value = -1264. kJ/mol; Corresponding Δ_fHº_liquid = -95.73 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
Quantity	Value	Units	Method	Reference	Comment
S°_liquid	149.45	J/mol*K	N/A	Giauque and Gordon, 1949	DH

Constant pressure heat capacity of liquid

C_p,liquid (J/mol*K)	Temperature (K)	Reference	Comment
86.90	285.	Giauque and Gordon, 1949	T = 15 to 283 K.; DH

Phase change data

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Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity	Value	Units	Method	Reference	Comment
T_boil	283.7	K	N/A	Majer and Svoboda, 1985
T_boil	286.15	K	N/A	Moureu and Dode, 1937, 2	Uncertainty assigned by TRC = 1.5 K; TRC
T_boil	283.85	K	N/A	Timmermans and Hennaut-Roland, 1937	Uncertainty assigned by TRC = 0.4 K; TRC
T_boil	283.88	K	N/A	Maass and Boomer, 1922	Uncertainty assigned by TRC = 0.2 K; TRC
T_boil	286.	K	N/A	Von Auwers and Eisenlohr, 1910	Uncertainty assigned by TRC = 4. K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_fus	160.6	K	N/A	McDonald, Shrader, et al., 1959	Uncertainty assigned by TRC = 0.07 K; TRC
T_fus	161.45	K	N/A	Timmermans and Hennaut-Roland, 1937	Uncertainty assigned by TRC = 0.4 K; TRC
T_fus	161.9	K	N/A	Maass and Boomer, 1922	Uncertainty assigned by TRC = 0.6 K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_triple	160.65	K	N/A	Wilhoit, Chao, et al., 1985	Uncertainty assigned by TRC = 0.05 K; TRC
T_triple	160.65	K	N/A	Giauque and Gordon, 1949, 2	Uncertainty assigned by TRC = 0.02 K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_c	468.9	K	N/A	Walters and Smith, 1952	Uncertainty assigned by TRC = 1.11 K; TRC
T_c	469.0	K	N/A	Hess and Tilton, 1950	Uncertainty assigned by TRC = 1. K; TRC
T_c	465.2	K	N/A	Maass and Boomer, 1922	Uncertainty assigned by TRC = 2. K; TRC
Quantity	Value	Units	Method	Reference	Comment
P_c	72.33	bar	N/A	Walters and Smith, 1952	Uncertainty assigned by TRC = 0.6894 bar; TRC
P_c	71.91	bar	N/A	Hess and Tilton, 1950	Uncertainty assigned by TRC = 0.7584 bar; TRC
Quantity	Value	Units	Method	Reference	Comment
ρ_c	7.13	mol/l	N/A	Walters and Smith, 1952	Uncertainty assigned by TRC = 0.23 mol/l; TRC
ρ_c	7.26	mol/l	N/A	Post, 1950	Uncertainty assigned by TRC = 0.23 mol/l; TRC
Quantity	Value	Units	Method	Reference	Comment
Δ_vapH°	25.51	kJ/mol	N/A	Majer and Svoboda, 1985
Δ_vapH°	25.9	kJ/mol	A	Stephenson and Malanowski, 1987	Based on data from 283. to 385. K.; AC

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Method	Reference	Comment
25.527	283.66	N/A	Giauque and Gordon, 1949	P = 101.325 kPa; DH
25.54	283.7	N/A	Majer and Svoboda, 1985
26.8	269.	A	Stephenson and Malanowski, 1987	Based on data from 239. to 284. K. See also McDonald, Shrader, et al., 1959, 2 and Dykyj, 1970.; AC
26.8	269.	A	Stephenson and Malanowski, 1987	Based on data from 223. to 284. K. See also Giauque and Gordon, 1949.; AC
25.5 ± 0.3	283.66	V	Giauque and Gordon, 1949, 3	ALS
26.9	290.	N/A	Moor, Kanep, et al., 1937	Based on data from 268. to 313. K.; AC

Entropy of vaporization

Δ_vapS (J/mol*K)	Temperature (K)	Reference	Comment
89.99	283.66	Giauque and Gordon, 1949	P; 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
182.59 to 283.59	4.386	1115.1	-29.015	McDonald, Shrader, et al., 1959, 2
273.4 to 304.9	5.84696	2022.83	62.656	Coles and Popper, 1950	Coefficents calculated by NIST from author's data.

Enthalpy of fusion

Δ_fusH (kJ/mol)	Temperature (K)	Reference	Comment
5.1731	160.65	Giauque and Gordon, 1949	DH
5.17	160.7	Domalski and Hearing, 1996	AC

Entropy of fusion

Δ_fusS (J/mol*K)	Temperature (K)	Reference	Comment
32.20	160.65	Giauque and Gordon, 1949	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:

Reaction thermochemistry data

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Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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Individual Reactions

= + 2 Ethylene oxide

By formula: C₁₆H₃₅NO₂ = C₁₂H₂₇N + 2C₂H₄O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-1004. ± 27.	kJ/mol	Eqk	Balcerowiak, Jerzykiewicz, et al., 1984	solid phase

= + Ethylene oxide

By formula: C₁₄H₃₁NO = C₁₂H₂₇N + C₂H₄O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-120.0 ± 4.6	kJ/mol	Eqk	Balcerowiak, Jerzykiewicz, et al., 1984	liquid phase

Gas phase ion energetics data

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Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
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 C₂H₄O⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	10.56 ± 0.01	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	774.2	kJ/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	745.3	kJ/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.15 ± 0.05	EI	Holmes and Lossing, 1991	LL
10.4 ± 0.1	PE	Aue, Webb, et al., 1980	LLK
10.4	PE	Aue and Bowers, 1979	LLK
10.57	EI	Holmes, Terlouw, et al., 1976	LLK
10.6 ± 0.1	PI	Corderman, LeBreton, et al., 1976	LLK
10.560	PE	Corderman, LeBreton, et al., 1976	LLK
10.56 ± 0.01	PI	Krassig, Reinke, et al., 1974	LLK
10.57	PE	Basch, Robin, et al., 1969	RDSH
10.566	S	Lowrey and Watanabe, 1958	RDSH
10.57 ± 0.01	PI	Watanabe, 1957	RDSH
10.57	EI	Vorob'ev, Furlei, et al., 1989	Vertical value; LL
10.57	PIPECO	Johnson, Powis, et al., 1982	Vertical value; LBLHLM
10.57	PE	Bieri, Asbrink, et al., 1982	Vertical value; LBLHLM
10.57	PE	Kimura, Katsumata, et al., 1981	Vertical value; LLK
10.568	PE	Aue, Webb, et al., 1975	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
CH⁺	22.8 ± 0.4	?	EI	Gallegos and Kiser, 1961	RDSH
CHO⁺	11.54 ± 0.03	CH₃	PI	Krassig, Reinke, et al., 1974	LLK
CHO⁺	12.2 ± 0.1	CH₃	EI	Gallegos and Kiser, 1961	RDSH
CH₂⁺	14.66 ± 0.09	?	PI	Krassig, Reinke, et al., 1974	LLK
CH₂⁺	16.5 ± 0.4	?	EI	Gallegos and Kiser, 1961	RDSH
CH₃⁺	13.06 ± 0.05	CO+H	PI	Krassig, Reinke, et al., 1974	LLK
CH₃⁺	14.3 ± 0.2	?	EI	Gallegos and Kiser, 1961	RDSH
CH₄⁺	11.79 ± 0.03	CO	PI	Krassig, Reinke, et al., 1974	LLK
CH₄⁺	12.3 ± 0.2	CO	EI	Gallegos and Kiser, 1961	RDSH
CO⁺	12.6 ± 0.4	CH₄	EI	Gallegos and Kiser, 1961	RDSH
C₂H⁺	24.0 ± 0.3	?	EI	Gallegos and Kiser, 1961	RDSH
C₂H₂⁺	15.7 ± 0.3	H₂O?	EI	Gallegos and Kiser, 1961	RDSH
C₂H₂O⁺	13.07 ± 0.05	H₂?	PI	Krassig, Reinke, et al., 1974	LLK
C₂H₂O⁺	14.0 ± 0.3	2H?	EI	Gallegos and Kiser, 1961	RDSH
C₂H₃⁺	12.92 ± 0.08	OH	PI	Krassig, Reinke, et al., 1974	LLK
C₂H₃⁺	14.3 ± 0.2	OH	EI	Gallegos and Kiser, 1961	RDSH
C₂H₃O⁺	11.53 ± 0.05	H	EI	Burgers and Holmes, 1982	LBLHLM
C₂H₃O⁺	11.62 ± 0.05	H	PI	Krassig, Reinke, et al., 1974	LLK
C₂H₃O⁺	12.1 ± 0.2	H	EI	Gallegos and Kiser, 1961	RDSH

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

GAS (50 mmHg, N2 ADDED, TOTAL PRESSURE 600 mmHg); DOW KBr FOREPRISM-GRATING; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 2 cm^-1 resolution

Data compiled by: Pamela M. Chu, Franklin R. Guenther, George C. Rhoderick, and Walter J. Lafferty

gas; IFS66V (Bruker); 3-Term B-H Apodization
0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
gas; IFS66V (Bruker); Boxcar Apodization
0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
gas; IFS66V (Bruker); Happ Genzel Apodization
0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
gas; IFS66V (Bruker); NB Strong Apodization
0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
gas; IFS66V (Bruker); Triangular Apodization
0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution

Mass spectrum (electron ionization)

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

Spectrum

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Additional Data

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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	18867

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UV/Visible spectrum

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Data compiled by: Victor Talrose, Alexander N. Yermakov, Alexy A. Usov, Antonina A. Goncharova, Axlexander N. Leskin, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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Additional Data

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Source	Fleming, et al., 1959
Owner	INEP CP RAS, NIST OSRD Collection (C) 2007 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.
Origin	INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS
Source reference	RAS UV No. 12873
Instrument	n.i.g.
Melting point	- 111.7
Boiling point	10.6

Vibrational and/or electronic energy levels

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Data compiled by: Takehiko Shimanouchi

Symmetry: C_2ν Symmetry Number σ = 2

Sym.	No	Approximate	Selected Freq.		Infrared		Raman		Comments

Species		type of mode	Value	Rating	Value	Phase	Value	Phase

a₁	1	CH2 s-str	3006	C	3006 S	gas	3005 S p	liq.
a₁	2	CH2 scis	1498	B	1498 W	gas	1490 W p	liq.
a₁	3	Ring str	1271	B	1271 S	gas	1266 S p	liq.
a₁	4	CH2 wag	1120	D	1118 W	solid solid	1120 M p	liq.
a₁	5	Ring deform	877	B	877 VS	gas	867 M dp	liq.
a₂	6	CH2 a-str	3063	D	ia		3063 W dp	liq.	OV(ν₁₃)
a₂	7	CH2 twist	1300	E	ia
a₂	8	CH2 rock	860	E	ia
b₁	9	CH2 s-str	3006	C	3006 S	gas	3005 S p	liq.	OV(ν₁)
b₁	10	CH2 scis	1472	B	1472 W	gas
b₁	11	CH2 wag	1151	D	1151 M	gas	1150 W dp	liq.
b₁	12	Ring deform	892	D	892 VS	gas
b₂	13	CH2 a-str	3065	B	3065 S	gas	3063 W dp	liq.
b₂	14	CH2 twist	1142	D	1142 M	gas	1150 W dp	liq.
b₂	15	CH2 rock	822	B	822 M	gas	807 M dp	liq.

Source: Shimanouchi, 1972

Notes

Very strong

Strong

Medium

Weak

Inactive

Polarized

Depolarized

Overlapped by band indicated in parentheses.

1~3 cm^-1 uncertainty

3~6 cm^-1 uncertainty

6~15 cm^-1 uncertainty

15~30 cm^-1 uncertainty

Gas Chromatography

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

Kovats' RI, non-polar column, isothermal

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Column type	Active phase	Temperature (C)	I	Reference	Comment
Packed	Apiezon L	120.	397.	Bogoslovsky, Anvaer, et al., 1978	Celite 545
Packed	Apiezon L	160.	410.	Bogoslovsky, Anvaer, et al., 1978	Celite 545

Normal alkane RI, non-polar column, temperature ramp

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Column type	Active phase	I	Reference	Comment
Capillary	OV-101	417.	Zenkevich, 2005	25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; T_start: 50. C; T_end: 250. C

Normal alkane RI, non-polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	Methyl Silicone	417.	Farkas, Héberger, et al., 2004	Program: not specified
Capillary	SPB-1	405.	Flanagan, Streete, et al., 1997	60. m/0.53 mm/5. μm, He; Program: 40C(6min) => 5C/min => 80C => 10C/min => 200C
Capillary	SPB-1	405.	Strete, Ruprah, et al., 1992	60. m/0.53 mm/5.0 μm, Helium; Program: 40 0C (6 min) 5 0C/min -> 80 0C 10 0C/min -> 200 0C
Capillary	SPB-1	400.	Strete, Ruprah, et al., 1992	60. m/0.53 mm/5.0 μm, Helium; Program: not specified
Capillary	OV-1	400.	Ramsey and Flanagan, 1982	Program: not specified

Normal alkane RI, polar column, custom temperature program

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Column type	Active phase	I	Reference	Comment
Capillary	Carbowax 20M	680.	Ramsey and Flanagan, 1982	Program: not specified

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, Vibrational and/or electronic energy levels, Gas Chromatography, NIST Free Links, NIST Subscription Links, 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]

Pell and Pilcher, 1965
Pell, A.S.; Pilcher, G., Measurements of heats of combustion by flame calorimetry. Part 3.-Ethylene oxide, trimethylene oxide, tetrahydrofuran and tetrahydropy, Trans. Faraday Soc., 1965, 61, 71-77. [all data]

Moureu and Dode, 1937
Moureu, H.; Dode, M., Chaleurs de formation de l'oxyde d'ethylene, de l'ethanediol et de quelques homologues, Bull. Soc. Chim. France, 1937, 4, 637-647. [all data]

Crog and Hunt, 1942
Crog, R.S.; Hunt, H., Heats of combustion. II. The heats of combustion of ethyl methyl ketone and ethylene oxide, J. Phys. Chem., 1942, 46, 1162-1163. [all data]

Dorofeeva O.V., 1992
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Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, Vibrational and/or electronic energy levels, Gas Chromatography, NIST Free Links, NIST Subscription Links, References

Symbols used in this document:

AE	Appearance energy
C_p,gas	Constant pressure heat capacity of gas
C_p,liquid	Constant pressure heat capacity of liquid
IE (evaluated)	Recommended ionization energy
P_c	Critical pressure
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
S°_liquid	Entropy of liquid at standard conditions
T_boil	Boiling point
T_c	Critical temperature
T_fus	Fusion (melting) point
T_triple	Triple point temperature
Δ_cH°_gas	Enthalpy of combustion of gas at standard conditions
Δ_cH°_liquid	Enthalpy of combustion of liquid at standard conditions
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_fH°_liquid	Enthalpy of formation of liquid at standard conditions
Δ_fusH	Enthalpy of fusion
Δ_fusS	Entropy of fusion
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_vapH	Enthalpy of vaporization
Δ_vapH°	Enthalpy of vaporization at standard conditions
Δ_vapS	Entropy of vaporization
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
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NIST Chemistry WebBook, SRD 69

Ethylene oxide

Gas phase thermochemistry data

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Gas Phase Heat Capacity (Shomate Equation)

Condensed phase thermochemistry data

Constant pressure heat capacity of liquid

Phase change data

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

Enthalpy of fusion

Entropy of fusion

Reaction thermochemistry data

Individual Reactions

Gas phase ion energetics data

Ionization energy determinations

Appearance energy determinations

IR Spectrum

Mass spectrum (electron ionization)

Spectrum

Help

Credits

Additional Data

UV/Visible spectrum

Spectrum

Help

Credits

Additional Data

Vibrational and/or electronic energy levels

Symmetry: C_2ν Symmetry Number σ = 2

Notes

Gas Chromatography

Kovats' RI, non-polar column, isothermal

Normal alkane RI, non-polar column, temperature ramp

Normal alkane RI, non-polar column, custom temperature program

Normal alkane RI, polar column, custom temperature program

References

Notes

Ethylene oxide

Gas phase thermochemistry data

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Gas Phase Heat Capacity (Shomate Equation)

Condensed phase thermochemistry data

Constant pressure heat capacity of liquid

Phase change data

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

Enthalpy of fusion

Entropy of fusion

Reaction thermochemistry data

Individual Reactions

Gas phase ion energetics data

Ionization energy determinations

Appearance energy determinations

IR Spectrum

Mass spectrum (electron ionization)

Spectrum

Help

Credits

Additional Data

UV/Visible spectrum

Spectrum

Help

Credits

Additional Data

Vibrational and/or electronic energy levels

Symmetry: C2ν Symmetry Number σ = 2

Notes

Gas Chromatography

Kovats' RI, non-polar column, isothermal

Normal alkane RI, non-polar column, temperature ramp

Normal alkane RI, non-polar column, custom temperature program

Normal alkane RI, polar column, custom temperature program

References

Notes

Symmetry: C_2ν Symmetry Number σ = 2