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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. - 1300.1300. - 6000.
A 25.6524053.33303
B 26.340462.504020
C -2.484837-0.475616
D -2.3736330.031360
E 0.139285-8.976605
F 117.613591.56433
G 236.7600254.3244
H 125.9380125.9380
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1963 Data last reviewed in March, 1963
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
298.34.79212.6212.7-0.00
300.34.81212.9212.70.07
400.36.51223.1214.03.63
500.38.46231.5216.77.38
600.40.44238.6219.811.32
700.42.34245.0222.915.46
800.44.14250.8226.119.79
900.45.79256.1229.124.28
1000.47.27261.0232.128.94
1100.48.58265.6234.933.73
1200.49.68269.8237.638.65
1300.50.56273.9240.343.66
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
1300.50.54273.8240.343.65
1400.51.41277.6242.848.75
1500.52.14281.2245.253.93
1600.52.74284.6247.659.18
1700.53.26287.8249.964.48
1800.53.71290.9252.169.83
1900.54.10293.8254.275.22
2000.54.45296.6256.280.65
2100.54.75299.2258.286.11
2200.55.02301.8260.191.59
2300.55.26304.2262.097.11
2400.55.48306.6263.8102.6
2500.55.67308.8265.6108.2
2600.55.85311.0267.3113.8
2700.56.01313.1268.9119.4
2800.56.16315.2270.5125.0
2900.56.29317.2272.1130.6
3000.56.41319.1273.7136.2
3100.56.52320.9275.2141.9
3200.56.63322.7276.6147.5
3300.56.72324.5278.0153.2
3400.56.80326.2279.4158.9
3500.56.88327.8280.8164.6
3600.56.95329.4282.1170.3
3700.57.02331.0283.4176.0
3800.57.08332.5284.7181.7
3900.57.13334.0285.9187.4
4000.57.19335.4287.1193.1
4100.57.23336.8288.3198.8
4200.57.27338.2289.5204.5
4300.57.31339.6290.7210.3
4400.57.35340.9291.8216.0
4500.57.38342.2292.9221.7
4600.57.42343.4294.0227.5
4700.57.45344.7295.0233.2
4800.57.47345.9296.1239.0
4900.57.50347.1297.1244.7
5000.57.52348.2298.1250.5
5100.57.55349.4299.1256.2
5200.57.57350.5300.1262.0
5300.57.59351.6301.1267.7
5400.57.62352.7302.0273.5
5500.57.64353.7302.9279.3
5600.57.66354.7303.9285.0
5700.57.68355.8304.8290.8
5800.57.71356.8305.6296.6
5900.57.73357.8306.5302.3
6000.57.76358.7307.4308.1

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