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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) 2741.437 - 6000.
A 28.57195
B -5.384682
C 1.038152
D -0.012100
E -4.261321
F 308.1788
G 164.2404
H 324.0002
ReferenceChase, 1998
Comment Data last reviewed in September, 1983
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
2741.20.80182.4163.950.79
2800.20.82182.8164.352.00
2900.20.89183.6164.954.09
3000.20.96184.3165.556.18
3100.21.05185.0166.258.28
3200.21.16185.6166.860.39
3300.21.28186.3167.362.52
3400.21.42186.9167.964.65
3500.21.58187.5168.566.80
3600.21.75188.2169.068.97
3700.21.94188.8169.571.15
3800.22.14189.3170.073.35
3900.22.36189.9170.575.58
4000.22.60190.5171.077.83
4100.22.86191.1171.580.10
4200.23.13191.6172.082.40
4300.23.42192.2172.584.73
4400.23.73192.7172.987.08
4500.24.05193.2173.389.47
4600.24.39193.8173.891.89
4700.24.75194.3174.294.35
4800.25.12194.8174.696.84
4900.25.51195.3175.199.38
5000.25.92195.9175.5101.9
5100.26.34196.4175.9104.6
5200.26.78196.9176.3107.2
5300.27.24197.4176.7109.9
5400.27.72197.9177.1112.7
5500.28.21198.4177.4115.5
5600.28.71198.9177.8118.3
5700.29.24199.5178.2121.2
5800.29.78200.0178.6124.2
5900.30.33200.5178.9127.2
6000.30.91201.0179.3130.2

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