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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. - 1500.1500. - 6000.
A 28.0202546.52943
B 13.797166.256126
C 3.742058-1.020035
D -2.4161010.062807
E 0.123292-10.86413
F -253.9504-278.3398
G 229.8627233.7948
H -245.3711-245.3711
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1977 Data last reviewed in June, 1977
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
298.33.79199.5199.5-0.00
300.33.80199.7199.50.07
400.34.75209.6200.83.49
500.36.05217.5203.47.03
600.37.47224.2206.310.70
700.38.93230.0209.314.52
800.40.41235.3212.218.49
900.41.86240.2215.122.60
1000.43.27244.7217.826.86
1100.44.61248.9220.431.25
1200.45.88252.8223.035.78
1300.47.05256.5225.440.43
1400.48.10260.0227.845.18
1500.49.04263.4230.050.04
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
1500.49.00263.4230.050.04
1600.49.94266.6232.254.99
1700.50.77269.6234.360.02
1800.51.50272.6236.465.14
1900.52.16275.4238.370.32
2000.52.75278.0240.375.57
2100.53.29280.6242.180.87
2200.53.78283.1243.986.22
2300.54.23285.5245.791.62
2400.54.65287.8247.497.07
2500.55.04290.1249.1102.6
2600.55.40292.2250.7108.1
2700.55.73294.3252.3113.6
2800.56.04296.4253.8119.2
2900.56.33298.3255.3124.8
3000.56.61300.3256.8130.5
3100.56.86302.1258.2136.2
3200.57.10303.9259.6141.9
3300.57.33305.7261.0147.6
3400.57.54307.4262.3153.3
3500.57.74309.1263.6159.1
3600.57.92310.7264.9164.9
3700.58.10312.3266.2170.7
3800.58.27313.8267.4176.5
3900.58.42315.4268.6182.3
4000.58.57316.8269.8188.2
4100.58.72318.3271.0194.0
4200.58.85319.7272.1199.9
4300.58.98321.1273.2205.8
4400.59.10322.5274.3211.7
4500.59.21323.8275.4217.6
4600.59.32325.1276.5223.6
4700.59.43326.4277.5229.5
4800.59.53327.6278.6235.4
4900.59.63328.8279.6241.4
5000.59.73330.0280.6247.4
5100.59.82331.2281.6253.3
5200.59.91332.4282.5259.3
5300.60.00333.5283.5265.3
5400.60.09334.7284.4271.3
5500.60.17335.8285.3277.3
5600.60.26336.8286.2283.4
5700.60.35337.9287.1289.4
5800.60.43339.0288.0295.4
5900.60.52340.0288.9301.5
6000.60.61341.0289.8307.5

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