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C2H4

C2H4 provides ideal gas thermodynamic properties for ethylene over the temperature range from 200 K to K based on property information from McBride et al, .  The reference state for specific enthalpy is based on the enthalpy of formation relative to the elements at 25 C.  The reference state for specific entropy is based on the Third Law of Thermodynamics.  The reference values are from:

Bonnie J. McBride, Michael J. Zehe, and Sanford Gordon

"NASA Glenn Coefficients for Calculating Thermodynamic Properties of Individual Species"

NASA/TP--, Sept.

https://www.grc.nasa.gov/WWW/CEAWeb/

Transport data were fit from the tabular data provided by: P.E. Liley and P.D. Desai, "Thermophysical Properties of Refrigerants", ASHRAE, , ISBN 1--10-9 for temperatures between 270 K and 475 K.  

Note that C2H4 provides thermodynamic properties assuming ideal gas behavior.  Use ethylene to provide real fluid properties in the subcooled, saturated mixture, and superheated regimes.  

Fluid Property Information

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Ethylene

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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

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Gas Phase Heat Capacity (Shomate Equation)

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

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References

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

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

Manion,
Manion, J.A., Evaluated Enthalpies of Formation of the Stable Closed Shell C1 and C2 Chlorinated Hydrocarbons, J. Phys. Chem. Ref. Data, , 31, 1, 123-172, https://doi.org/10./1. . [all data]

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

Rossini and Knowlton,
Rossini, F.d.; Knowlton, J.W., Calorimetric determination of the heats of combustion of ethylene and propylene, J. Res. NBS, , 19, 249-262. [all data]

Cox and Pilcher,
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, , 1-636. [all data]

Thermodynamics Research Center,
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, . [all data]

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

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

East A.L.L.,
East A.L.L., Ab initio statistical thermodynamical models for the computation of third-law entropies, J. Chem. Phys., , 106, -. [all data]

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

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

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

Notes

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For more information, please visit Ethylene (C2H4) Gas.

• Symbols used in this document:
  Cp,gas Constant pressure heat capacity of gas S°gas,1 bar Entropy of gas at standard conditions (1 bar) 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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