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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. to 6000.
A 20.78600
B 0.000001
C -2.363430×10-7
D 1.060101×10-8
E 3.979470×10-8
F -6.197350
G 201.3890
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in March, 1982
Temperature
(K)
Cp
(J/mol*K)

(J/mol*K)
-(G° - H°298.15)/T
(J/mol*K)
H° - H°298.15
(kJ/mol)
298.20.79176.2176.2-0.00
300.20.79176.4176.20.04
400.20.79182.3177.12.12
500.20.79187.0178.64.20
600.20.79190.8180.36.27
700.20.79194.0182.08.35
800.20.79196.8183.710.43
900.20.79199.2185.312.51
1000.20.79201.4186.814.59
1100.20.79203.4188.216.67
1200.20.79205.2189.618.75
1300.20.79206.8190.820.82
1400.20.79208.4192.022.90
1500.20.79209.8193.224.98
1600.20.79211.2194.227.06
1700.20.79212.4195.329.14
1800.20.79213.6196.331.22
1900.20.79214.7197.233.30
2000.20.79215.8198.135.37
2100.20.79216.8199.037.45
2200.20.79217.8199.839.53
2300.20.79218.7200.641.61
2400.20.79219.6201.443.69
2500.20.79220.4202.145.77
2600.20.79221.3202.847.85
2700.20.79222.0203.549.92
2800.20.79222.8204.252.00
2900.20.79223.5204.954.08
3000.20.79224.2205.556.16
3100.20.79224.9206.158.24
3200.20.79225.6206.760.32
3300.20.79226.2207.362.40
3400.20.79226.8207.964.48
3500.20.79227.4208.466.55
3600.20.79228.0208.968.63
3700.20.79228.6209.570.71
3800.20.79229.1210.072.79
3900.20.79229.7210.574.87
4000.20.79230.2211.076.95
4100.20.79230.7211.479.03
4200.20.79231.2211.981.10
4300.20.79231.7212.483.18
4400.20.79232.2212.885.26
4500.20.79232.7213.287.34
4600.20.79233.1213.789.42
4700.20.79233.6214.191.50
4800.20.79234.0214.593.58
4900.20.79234.4214.995.65
5000.20.79234.8215.397.73
5100.20.79235.3215.799.81
5200.20.79235.7216.1101.9
5300.20.79236.1216.4104.0
5400.20.79236.4216.8106.0
5500.20.79236.8217.2108.1
5600.20.79237.2217.5110.2
5700.20.79237.6217.9112.3
5800.20.79237.9218.2114.4
5900.20.79238.3218.5116.4
6000.20.79238.6218.9118.5

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