The thermodynamic properties (standard heat capacity at constant pressure, standard entropy, Gibbs energy function, change of enthalpy above the reference temperature) and the formation properties (enthalpy of formation, Gibbs energy of formation, and equilibirum constant) are tabulated as functions of temperature in the range 298.15 to 1500 K for 80 important substances in the standard state. The reference temperature, Tr, is equal to 298.15 K. The standard state pressure is taken as 1 bar (100,000 Pa). The numerical data are extracted from IVTANTHERMO databases (Ref. 1) except for C2H4O, C3H6O, C6H6, C6H6O, C10H8, and CH5N, which are based upon TRC Tables (Ref. 2).
Column definitions for Table 2 are as follows.
Column heading | Definition |
T | Temperature, in K |
Cpº | Standard heat capacity at constant pressure; in units J K-1 mol-1 |
Sº | Standard entropy, in units J K-1 mol-1 |
-(Gº-Hº(T)) | Negative of the Gibbs energy function, in units J K-1 mol-1 |
(H-Hº(T)) | Change of enthalpy above the reference temperature (also called high-temperature molar heat content), in units kJ mol-1 |
ΔfHº | Enthalpy of formation, in units kJ mol-1 |
ΔfGº | Gibbs energy of formation, in kJ mol-1 |
Log Kf | Log base 10 of equilibrium constant |
Table 1 contains a cross-reference of chemical substances and subtables of Table 2. Table 2 contains the thermodynamic data for each chemical substance at a wide variety of temperatures. Phase transitions when they occur are clearly indicated. The tables are presented in the JANAF Thermochemical Tables format (Ref. 3). See the references for information on standard states and other details.
No. | Mol. form. | Name | State |
Continued on next page... | |||
1 | Ar | Argon | g |
2 | Br | Bromine (atomic) | g |
3 | Br2 | Bromine | g |
4 | BrH | Hydrogen bromide | g |
5 | C | Carbon (graphite) | cr |
6 | C | Carbon (diamond) | cr |
7 | C2 | Dicarbon | g |
8 | C3 | Propadienediylidene | g |
9 | CO | Carbon monoxide | g |
10 | CO2 | Carbon dioxide | g |
11 | CH4 | Methane | g |
12 | C2H2 | Acetylene | g |
13 | C2H4 | Ethylene | g |
14 | C2H6 | Ethane | g |
15 | C3H6 | Cyclopropane | g |
16 | C3H8 | Propane | g |
17 | C6H6 | Benzene | l |
18 | C6H6 | Benzene | g |
19 | C10H8 | Naphthalene | cr, l |