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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
Deltafgas271.96kJ/molReviewChase, 1998Data last reviewed in June, 1983
Quantity Value Units Method Reference Comment
gas,1 bar169.03J/mol*KReviewChase, 1998Data last reviewed in June, 1983

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) 2476.57 - 6000.
A 20.25299
B 0.569727
C -0.209892
D 0.025810
E 3.049200
F 272.5010
G 201.4458
H 271.9604
ReferenceChase, 1998
Comment Data last reviewed in June, 1983

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
Deltafliquid5.58kJ/molReviewChase, 1998Data last reviewed in June, 1983
Quantity Value Units Method Reference Comment
liquid,1 bar59.25J/mol*KReviewChase, 1998Data last reviewed in June, 1983
Quantity Value Units Method Reference Comment
solid40.83J/mol*KReviewChase, 1998Data last reviewed in June, 1983

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) 302.92 - 2476.57
A 24.62138
B 2.701388
C -1.272134
D 0.196526
E 0.286145
F -0.908736
G 89.90830
H 5.577983
ReferenceChase, 1998
Comment Data last reviewed in June, 1983

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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View table.

Temperature (K) 298. - 302.92
A 102.3394
B -347.5134
C 603.3621
D -360.7047
E -1.490304
F -24.68472
G 236.2780
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in June, 1983

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
Tfus302.92KN/AMarsh, 1987Uncertainty assigned by TRC = 0.004 K; recommended as calibration standard
Quantity Value Units Method Reference Comment
Ttriple302.92KN/AAnonymous, 1988Uncertainty assigned by TRC = 0.0005 K; nominal value, from the catalog
Ttriple302.92KN/AMarsh, 1987Uncertainty assigned by TRC = 0.0003 K; recommended as calibration standard

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.

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

Marsh, 1987
Marsh, K.N., Recommended Reference Materials for the Realization of Physicochemical Properties, Blackwell Sci. Pub., Oxford, 1987. [all data]

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


Notes

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