Ethane - The NIST WebBook

Ethane

• Formula: C2H6
• Molecular weight: 30.0690
• IUPAC Standard InChI: InChI=1S/C2H6/c1-2/h1-2H3 Copy
• IUPAC Standard InChIKey: OTMSDBZUPAUEDD-UHFFFAOYSA-N Copy
• CAS Registry Number: 74-84-0
• Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file View 3d structure (requires JavaScript / HTML 5)
• Species with the same structure:
  • 1-Ethenyl-1-methyl-2,4-bis-(1-methylethenyl)-1S-1α,2β,4α-cyclohexane
• Isotopologues:
  • pentadeuteroethane
  • Ethane-d1
• Other names: Bimethyl; Dimethyl; Ethyl hydride; Methylmethane; C2H6; UN 1035; UN 1961
• Information on this page:
  • Gas phase thermochemistry data
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Vibrational and/or electronic energy levels
  • 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
  • Reference simulation
• Options:
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Data at NIST subscription sites:

• 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

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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: 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
ΔfH°gas	-84. ± 0.4	kJ/mol	Review	Manion, 2002	adopted recommendation of Gurvich, Veyts, et al., 1991; DRB
ΔfH°gas	-83.8 ± 0.3	kJ/mol	Ccb	Pittam and Pilcher, 1972	ALS
ΔfH°gas	-84.67 ± 0.49	kJ/mol	Ccb	Prosen and Rossini, 1945	Hf derived from Heat of Hydrogenation; ALS
Quantity	Value	Units	Method	Reference	Comment
ΔcH°gas	-1560.7 ± 0.3	kJ/mol	Ccb	Pittam and Pilcher, 1972	Corresponding ΔfHºgas = -83.85 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
ΔcH°gas	-1559.9 ± 0.46	kJ/mol	Ccb	Prosen and Rossini, 1945	Hf derived from Heat of Hydrogenation; Corresponding ΔfHºgas = -84.64 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS
ΔcH°gas	-1559.8 ± 0.46	kJ/mol	Ccb	Rossini, 1934	Corresponding ΔfHºgas = -84.68 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
35.70	100.	Gurvich, Veyts, et al., 1989	p=1 bar. Recommended entropies and heat capacities are in good agreement with those obtained from other statistical thermodynamic calculations [ Pitzer K.S., 1944, Chao J., 1973, Pamidimukkala K.M., 1982].; GT
42.30	200.
52.49	298.15
52.71	300.
65.46	400.
77.94	500.
89.19	600.
99.14	700.
107.94	800.
115.71	900.
122.55	1000.
128.55	1100.
133.80	1200.
138.39	1300.
142.40	1400.
145.90	1500.
148.98	1600.
151.67	1700.
154.04	1800.
156.14	1900.
158.00	2000.
159.65	2100.
161.12	2200.
162.43	2300.
163.61	2400.
164.67	2500.
165.63	2600.
166.49	2700.
167.28	2800.
168.00	2900.
168.65	3000.

Constant pressure heat capacity of gas

Cp,gas (J/mol*K)	Temperature (K)	Reference	Comment
41.66 ± 0.31	189.20	Halford J.O., 1957	Please also see Eucken A., 1933, Kistiakowsky G.B., 1939, Dailey B.P., 1943.; GT
43.25 ± 0.32	209.30
45.08 ± 0.34	229.65
47.27 ± 0.35	249.90
47.17 ± 0.35	250.15
49.68 ± 0.37	272.00
49.51 ± 0.04	272.07
50.66 ± 0.42	279.00
52.14 ± 0.39	292.00
53.27 ± 0.07	302.70
57.40 ± 0.04	335.82
58.91	347.65
60.38	359.75
61.04 ± 0.10	364.78
62.10 ± 0.47	373.60
63.89	387.55
72.43	451.95
80.08	520.55
86.27	561.65
90.46	603.25

References

Go To: Top, Gas phase thermochemistry data, Notes

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

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]

Pittam and Pilcher, 1972 Pittam, D.A.; Pilcher, G., Measurements of heats of combustion by flame calorimetry. Part 8.-Methane, ethane, propane, n-butane and 2-methylpropane, J. Chem. Soc. Faraday Trans. 1, 1972, 68, 2224-2229. [all data]

Prosen and Rossini, 1945 Prosen, E.J.; Rossini, F.D., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, J. Res. NBS, 1945, 263-267. [all data]

Rossini, 1934 Rossini, F.D., Calorimetric determination of the heats of combustion of ethane, propane, normal butane, and normal pentane, J. Res. NBS, 1934, 12, 735-750. [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]

Pitzer K.S., 1944 Pitzer K.S., Thermodynamics of gaseous paraffins. Specific heat and related properties, Ind. Eng. Chem., 1944, 36, 829-831. [all data]

Chao J., 1973 Chao J., Ideal gas thermodynamic properties of ethane and propane, J. Phys. Chem. Ref. Data, 1973, 2, 427-438. [all data]

Pamidimukkala K.M., 1982 Pamidimukkala K.M., Ideal gas thermodynamic properties of CH3, CD3, CD4, C2D2, C2D4, C2D6, C2H6, CH3N2CH3, and CD3N2CD3, J. Phys. Chem. Ref. Data, 1982, 11, 83-99. [all data]

Halford J.O., 1957 Halford J.O., Standard heat capacities of gaseous methanol, ethanol, methane and ethane at 279 K by thermal conductivity, J. Phys. Chem., 1957, 61, 1536-1539. [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]

Kistiakowsky G.B., 1939 Kistiakowsky G.B., Gaseous heat capacities. I. The method and the heat capacities of C2H6 and C2D6, J. Chem. Phys., 1939, 7, 281-288. [all data]

Dailey B.P., 1943 Dailey B.P., The heat capacities at higher temperatures of ethane and propane, J. Am. Chem. Soc., 1943, 65, 42-44. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, References

• Symbols used in this document:

  Cp,gas	Constant pressure heat capacity of gas
  ΔcH°gas	Enthalpy of combustion of gas at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

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