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Hydrogen

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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.

QuantityValueUnitsMethodReferenceComment
gas,1 bar130.680 ± 0.003J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar130.68J/mol*KReviewChase, 1998Data last reviewed in March, 1977

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)298. - 1000.1000. - 2500.2500. - 6000.
A33.06617818.56308343.413560
B-11.36341712.257357-4.293079
C11.432816-2.8597861.272428
D-2.7728740.268238-0.096876
E-0.1585581.977990-20.533862
F-9.980797-1.147438-38.515158
G172.707974156.288133162.081354
H0.00.00.0
ReferenceChase, 1998Chase, 1998Chase, 1998
CommentData last reviewed in March, 1977; New parameter fit October 2001Data last reviewed in March, 1977; New parameter fit October 2001Data last reviewed in March, 1977; New parameter fit October 2001

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.

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, References