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Gas Phase Heat Capacity (Shomate Equation)

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

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) 3133.345 - 6000.
A 11.29253
B 6.989707
C -1.110305
D 0.122354
E 5.689278
F 423.5380
G 206.3591
H 415.4716
ReferenceChase, 1998
Comment Data last reviewed in March, 1978
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
3133.26.64236.7215.167.51
3200.26.85237.2215.669.29
3300.27.19238.1216.371.99
3400.27.52238.9216.974.73
3500.27.87239.7217.577.50
3600.28.21240.5218.280.30
3700.28.57241.3218.883.14
3800.28.93242.0219.486.02
3900.29.30242.8220.088.93
4000.29.67243.5220.691.88
4100.30.06244.3221.194.86
4200.30.45245.0221.797.89
4300.30.85245.7222.2101.0
4400.31.27246.4222.8104.1
4500.31.69247.1223.3107.2
4600.32.13247.8223.8110.4
4700.32.58248.5224.4113.6
4800.33.04249.2224.9116.9
4900.33.52249.9225.4120.2
5000.34.01250.6225.9123.6
5100.34.51251.3226.4127.0
5200.35.03251.9226.8130.5
5300.35.57252.6227.3134.0
5400.36.12253.3227.8137.6
5500.36.69254.0228.3141.3
5600.37.28254.6228.7145.0
5700.37.89255.3229.2148.7
5800.38.52255.9229.6152.6
5900.39.17256.6230.1156.4
6000.39.85257.3230.5160.4

References

Go To: Top, Gas Phase Heat Capacity (Shomate Equation), 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]


Notes

Go To: Top, Gas Phase Heat Capacity (Shomate Equation), References