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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) 3156.584 - 6000.
A 27.13127
B -2.587562
C 0.295110
D 0.015200
E 0.041830
F 421.4585
G 214.1643
H 430.1152
ReferenceChase, 1998
Comment Data last reviewed in December, 1976
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
3157.22.39238.8217.467.55
3200.22.38239.1217.768.52
3300.22.36239.8218.470.76
3400.22.35240.5219.073.00
3500.22.35241.1219.675.23
3600.22.35241.7220.277.46
3700.22.37242.4220.879.70
3800.22.40243.0221.481.94
3900.22.43243.5222.084.18
4000.22.48244.1222.586.43
4100.22.53244.7223.088.68
4200.22.60245.2223.690.93
4300.22.67245.7224.193.20
4400.22.76246.3224.695.47
4500.22.85246.8225.197.75
4600.22.95247.3225.5100.0
4700.23.07247.8226.0102.3
4800.23.19248.3226.5104.7
4900.23.33248.7226.9107.0
5000.23.47249.2227.4109.3
5100.23.63249.7227.8111.7
5200.23.79250.1228.2114.0
5300.23.97250.6228.6116.4
5400.24.16251.0229.0118.8
5500.24.36251.5229.4121.3
5600.24.57251.9229.8123.7
5700.24.79252.4230.2126.2
5800.25.02252.8230.6128.7
5900.25.26253.2231.0131.2
6000.25.51253.7231.4133.7

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