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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.

Quantity Value Units Method Reference Comment
Δfgas195.2 ± 0.8kJ/molReviewCox, Wagman, et al., 1984CODATA Review value
Δfgas195.20kJ/molReviewChase, 1998Data last reviewed in March, 1962
Quantity Value Units Method Reference Comment
gas,1 bar175.375 ± 0.005J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar175.37J/mol*KReviewChase, 1998Data last reviewed in March, 1962

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) 2019.022 to 6000.
A -85.65861
B 69.28160
C -13.31750
D 0.840030
E 73.14720
F 333.3485
G 170.0411
H 195.2003
ReferenceChase, 1998
Comment Data last reviewed in March, 1962

Condensed phase thermochemistry data

Go To: Top, Gas 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.

Quantity Value Units Method Reference Comment
Δfliquid4.28kJ/molReviewChase, 1998Data last reviewed in March, 1962
Quantity Value Units Method Reference Comment
liquid,1 bar71.71J/mol*KReviewChase, 1998Data last reviewed in March, 1962
Quantity Value Units Method Reference Comment
solid,1 bar64.80 ± 0.30J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
solid64.78J/mol*KReviewChase, 1998Data last reviewed in March, 1962

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) 600.6 to 2019.022
A 38.00449
B -14.62249
C 7.255475
D -1.033370
E -0.330775
F -7.944328
G 118.7992
H 4.282993
ReferenceChase, 1998
Comment Data last reviewed in March, 1962

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. to 600.6
A 25.01450
B 5.441836
C 4.061367
D -1.236214
E -0.010657
F -7.772575
G 93.19902
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in March, 1962

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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]


Notes

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