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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 37.8854059.43920
B 25.741901.347181
C -11.16580-0.234157
D 1.8602710.014361
E -0.208487-7.891410
F 571.4600551.4970
G 269.1930285.1220
H 584.5050584.5050
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1966 Data last reviewed in June, 1966
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
298.42.27231.7231.7-0.01
300.42.34232.0231.70.08
400.45.21244.6233.44.46
500.47.36254.9236.79.10
600.49.13263.7240.513.92
700.50.65271.4244.418.91
800.51.96278.2248.224.05
900.53.11284.4251.929.30
1000.54.11290.1255.434.66
1100.54.99295.3258.840.12
1200.55.77300.1262.045.66
1300.56.44304.6265.151.27
1400.57.04308.8268.156.94
1500.57.56312.7271.062.67
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
1500.57.47312.7271.062.68
1600.57.97316.5273.768.46
1700.58.39320.0276.374.27
1800.58.75323.4278.880.13
1900.59.07326.5281.386.02
2000.59.34329.6283.691.94
2100.59.58332.5285.997.89
2200.59.79335.3288.0103.9
2300.59.98337.9290.2109.8
2400.60.15340.5292.2115.9
2500.60.31342.9294.2121.9
2600.60.44345.3296.1127.9
2700.60.57347.6298.0134.0
2800.60.68349.8299.8140.0
2900.60.79351.9301.5146.1
3000.60.88354.0303.2152.2
3100.60.97356.0304.9158.3
3200.61.05357.9306.5164.4
3300.61.13359.8308.1170.5
3400.61.19361.6309.7176.6
3500.61.26363.4311.2182.7
3600.61.32365.1312.7188.9
3700.61.37366.8314.1195.0
3800.61.42368.4315.5201.1
3900.61.46370.0316.9207.3
4000.61.51371.6318.2213.4
4100.61.55373.1319.6219.6
4200.61.58374.6320.8225.7
4300.61.62376.0322.1231.9
4400.61.65377.5323.4238.1
4500.61.68378.8324.6244.2
4600.61.71380.2325.8250.4
4700.61.73381.5326.9256.6
4800.61.76382.8328.1262.7
4900.61.78384.1329.2268.9
5000.61.80385.4330.3275.1
5100.61.82386.6331.4281.3
5200.61.84387.8332.5287.5
5300.61.86389.0333.5293.6
5400.61.88390.1334.6299.8
5500.61.89391.2335.6306.0
5600.61.91392.4336.6312.2
5700.61.93393.5337.6318.4
5800.61.94394.5338.6324.6
5900.61.96395.6339.5330.8
6000.61.98396.6340.5337.0

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