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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes

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

Quantity Value Units Method Reference Comment
Deltafgas130.40 ± 0.40kJ/molReviewCox, Wagman, et al., 1984CODATA Review value
Deltafgas130.42kJ/molReviewChase, 1998Data last reviewed in December, 1978
Quantity Value Units Method Reference Comment
gas,1 bar160.990 ± 0.004J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar160.99J/mol*KReviewChase, 1998Data last reviewed in December, 1978

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) / 1000.

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Temperature (K) 1180.173 - 6000.
A 18.20166
B 2.313999
C -0.736547
D 0.079950
E 1.073557
F 126.9388
G 184.6977
H 130.4203
ReferenceChase, 1998
Comment Data last reviewed in December, 1978

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, References, Notes

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

Quantity Value Units Method Reference Comment
Deltafliquid6.52kJ/molReviewChase, 1998Data last reviewed in December, 1978
Quantity Value Units Method Reference Comment
liquid,1 bar50.79J/mol*KReviewChase, 1998Data last reviewed in December, 1978
Quantity Value Units Method Reference Comment
solid,1 bar41.63 ± 0.15J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
solid41.72J/mol*KReviewChase, 1998Data last reviewed in December, 1978

Liquid 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) / 1000.

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Temperature (K) 692.73 - 1180.173
A 31.38004
B -9.647635×10-9
C 6.798541×10-9
D -1.574453×10-9
E -3.249003×10-10
F -3.590873
G 86.68160
H 6.519007
ReferenceChase, 1998
Comment Data last reviewed in December, 1978

Solid 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) / 1000.

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Temperature (K) 298. - 692.73
A 25.60123
B -4.405292
C 20.42206
D -7.399697
E -0.045801
F -7.755964
G 72.91373
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in December, 1978

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References, Notes

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

Data compiled by: Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director

Quantity Value Units Method Reference Comment
Tfus965.74KN/AAnonymous, 1988Uncertainty assigned by TRC = 0.05 K; nominal value, from the catalog
Tfus692.65KN/AAnonymous, 1988Uncertainty assigned by TRC = 0.1 K; nominal value, from the catalog
Tfus692.83KN/ACallanan, Sullivan, et al., 1985Uncertainty assigned by TRC = 0.3 K

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:


References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes

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

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

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

Anonymous, 1988
Anonymous, X., , NBS Spec. Publ. (U. S.) 260, 1988. [all data]

Callanan, Sullivan, et al., 1985
Callanan, J.E.; Sullivan, S.A.; Vecchia, D.F., Feasibility Study for the Development of Standards Using Differential Scanning Calorimetry, Natl. Bur. Stand. Spec. Publ. 260-99 1985, 1985. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References