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reaction is simply the ratio of enthalpy change to temperature.
Entropies are additive properties and entropies of reaction can be calculated in the same manner as for enthalpies, so Hess's law applies:
(2.117)
The total entropy of a substance can be calculated as:
(2.118)
Table 2.2 Standard state thermodynamic data for some important minerals.
| Phase/ Compound | Formula |
|
SO J/K-mol |
|
|
a | CP b | c |
| H2Og | H2O (gas) | −241.81 | 188.74 | −228.57 | 24789.00 | 30.54 | 0.01029 | 0 |
| H2Ol | H2O (liquid) | −285.84 | 69.92 | −237.18 | 18.10 | 29.75 | 0.03448 | 0 |
| CO2 | CO2 | −393.51 | 213.64 | −394.39 | 24465.10 | 44.22 | 0.00879 | 861904 |
| Calcite | CaCO3 | −1207.30 | 92.68 | −1130.10 | 36.93 | 104.52 | 0.02192 | 2594080 |
| Graphite | C | 0 | 5.740 | 5.298 | ||||
| Diamond | C | 1.86 | 2.37 | 3.417 | ||||
| Aragonite | CaCO3 | −1207.21 | 90.21 | −1129.16 | 34.15 | 84.22 | 0.04284 | 1397456 |
| α-Qz | SiO2 | −910.65 | 41.34 | −856.24 | 22.69 | 46.94 | 0.03431 | 1129680 |
| β-Qz | SiO2 | −910.25 | 41.82 | −856.24 | 60.29 | 0.00812 | 0 | |
| Cristobalite | SiO2 | −853.10 | 43.40 | −853.10 | 25.74 | 58.49 | 0.01397 | 1594104 |
| Coesite | SiO2 | −851.62 | 40.38 | −851.62 | 20.64 | 46.02 | 0.00351 | 1129680 |
| Periclase | MgO | −601.66 | 26.94 | −569.38 | 11.25 | 42.59 | 0.00728 | 619232 |
| Magnetite | Fe3O4 | −1118.17 | 145.73 | −1014.93 | 44.52 | 91.55 | 0.20167 | 0 |
| Spinel | MgAl2O4 | −2288.01 | 80.63 | −2163.15 | 39.71 | 153.86 | 0.02684 | 4062246 |
| Hematite | Fe2O3 | −827.26 | 87.61 | −745.40 | 30.27 | 98.28 | 0.07782 | 1485320 |
| Corundum | Al2O3 | −1661.65 | 50.96 | −1568.26 | 25.58 | 11.80 | 0.03506 | 3506192 |
| Kyanite | Al2SiO5 | −2581.10 |
