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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) 298. - 6000.
A 35.39066
B 2.156652
C -0.550640
D 0.057158
E -0.318310
F -31.79212
G 266.1505
H -20.08303
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)
298.32.40225.7225.7-0.00
300.32.45225.9225.70.06
400.34.18235.5227.03.40
500.35.07243.3229.56.87
600.35.61249.7232.410.41
700.36.00255.2235.313.99
800.36.30260.1238.117.60
900.36.53264.4240.721.25
1000.36.74268.2243.324.91
1100.36.91271.7245.728.59
1200.37.06274.9248.032.29
1300.37.20277.9250.236.00
1400.37.33280.7252.339.73
1500.37.44283.3254.343.47
1600.37.54285.7256.247.22
1700.37.64287.9258.050.98
1800.37.72290.1259.754.74
1900.37.80292.1261.358.52
2000.37.88294.1262.962.30
2100.37.95295.9264.566.10
2200.38.01297.7265.969.89
2300.38.07299.4267.473.70
2400.38.13301.0268.777.51
2500.38.18302.6270.081.32
2600.38.23304.1271.385.15
2700.38.28305.5272.688.97
2800.38.33306.9273.892.80
2900.38.37308.3274.996.64
3000.38.41309.6276.1100.5
3100.38.45310.8277.2104.3
3200.38.50312.0278.2108.2
3300.38.54313.2279.3112.0
3400.38.58314.4280.3115.9
3500.38.62315.5281.3119.7
3600.38.66316.6282.2123.6
3700.38.70317.6283.2127.5
3800.38.75318.7284.1131.3
3900.38.80319.7285.0135.2
4000.38.85320.7285.9139.1
4100.38.90321.6286.7143.0
4200.38.95322.6287.6146.9
4300.39.01323.5288.4150.8
4400.39.07324.4289.2154.7
4500.39.14325.3290.0158.6
4600.39.21326.1290.8162.5
4700.39.28327.0291.5166.4
4800.39.36327.8292.3170.4
4900.39.45328.6293.0174.3
5000.39.54329.4293.7178.3
5100.39.64330.2294.5182.2
5200.39.74331.0295.1186.2
5300.39.85331.7295.8190.2
5400.39.97332.5296.5194.2
5500.40.09333.2297.2198.2
5600.40.23333.9297.8202.2
5700.40.37334.6298.5206.2
5800.40.52335.3299.1210.2
5900.40.68336.0299.7214.3
6000.40.84336.7300.3218.4

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