Standard enthalpies of formation are required in order to calculate the enthalpies of key reactions in cement kilns, and to calculate overall theoretical energy requirements. The values of standard enthalpy of formation from the elements in their standard states are in kJ/mol, in the standard state 298.15 K and 101325 Pa.
| Phase | Formula | Molar Mass | ΔfH° kJ/mol |
|---|---|---|---|
| Quartz | SiO2 | 60.0843 | -910.86 |
| Kaolinite | Si2Al2O5(OH)4 | 258.1606 | -4120.40 |
| Pyrophyllite | Si2AlO5(OH) | 180.1569 | -2821.10 |
| Hematite | Fe2O3 | 159.6882 | -825.48 |
| Calcite | CaCO3 | 100.0872 | -1206.92 |
| Dolomite | CaMg(CO3)2 | 184.4019 | -2330.09 |
| Phlogopite | KMg3AlSi3O12(OH)2 | 417.2616 | -6075.22 |
| Water (l) | H2O | 18.0153 | -285.830 |
| Water (g) | H2O | 18.0153 | -241.826 |
| Carbon monoxide | CO | 28.0104 | -110.530 |
| Carbon dioxide | CO2 | 44.0098 | -393.520 |
| Albite | NaSi3AlO8 | 262.2230 | -3948.30 |
| Orthoclase | KSi3AlO8 | 278.3315 | -3921.20 |
| Ilmenite | FeTiO3 | 151.7102 | -1234.08 |
| Hydroxyapatite | Ca5(PO4)3(OH) | 502.3115 | -6752.00 |
| Bixbyite | Mn2O3 | 157.8743 | -956.90 |
| Lime | CaO | 56.0774 | -635.09 |
| Periclase | MgO | 40.3049 | -601.25 |
| Tricalcium silicate | Ca3SiO5 | 228.3165 | -2929.20 |
| Dicalcium silicate | Ca2SiO4 | 172.2391 | -2307.50 |
| Tricalcium aluminate | Ca3Al2O6 | 270.1935 | -3588.60 |
| Tetracalcium aluminoferrite | Ca4Al2Fe2O10 | 485.9591 | -5092.89 |
| Ye'elimite | Ca4Al6O12.SO4 | 610.2591 | -8523.00 |
| Ternesite | Ca5(SiO4)2.SO4 | 480.2591 | -5993.00 |
| Forsterite | Mg2SiO4 | 140.6941 | -2176.93 |
| Sulfur dioxide | SO2 | 64.0663 | -296.82 |
| Hydrogen sulfide | H2S | 34.0835 | -20.50 |
| Thenardite | Na2SO4 | 142.0446 | -1387.58 |
| Arcanite | K2SO4 | 174.2617 | -1437.71 |
| Anhydrite | CaSO4 | 136.1431 | -1425.22 |
| Hydrogen chloride | HCl | 36.4595 | -92.31 |
| Sodium aluminate | Na2Al2O4 | 163.9402 | -2268.50 |
| Potassium aluminate | K2Al2O4 | 196.1573 | -2281.10 |
| "Tetracalcium magnesotitanite" | Ca4Mg2Ti2O10 | 464.6760 | -5669.00 |
| Whitlockite | Ca3(PO4)2 | 310.1767 | -4120.80 |
| Tetracalcium aluminomanganite | Ca4Al2Mn2O10 | 484.1451 | -5223.00 |