Table
Standard Enthalpies of Formation (at 25°C)*
| Substance or Ion | ΔHf° (kJ/mol) | Substance or Ion | ΔHf° (kJ/mol) | Substance or Ion | ΔHf° (kJ/mol) | Substance or Ion | ΔHf° (kJ/mol) |
|---|
| e− (g) | 0 |
|---|
| Bromine | Chlorine | Fluorine | Iodine |
|---|
| Br(g) | 111.9 | Cl(g) | 121.3 | F(g) | 79.39 | I(g) | 106.8 |
| Br− (aq) | −121.5 | Cl− (aq) | −167.2 | F− (g) | −255.1 | I− (aq) | −55.19 |
| Br− (g) | −219.0 | Cl− (g) | −234.0 | F − (aq) | −332.6 | I− (g) | −194.6 |
| Br2 (g) | 30.91 | Cl2 (g) | 0 | F2 (g) | 0 | I2 (s) | 0 |
| Br2 (l) | 0 | HCl(g) | −92.31 | HF(g) | −272.5 | HI(g) | 26.36 |
| HBr(g) | −36.44 |
| Carbon |
|---|
| C(g) | 716.7 |
| C(s, diamond) | 1.897 |
| C(s, graphite) | 0 |
| CO(g) | −110.5 |
| CO2 (g) | −393.5 |
| CO32− (aq) | −677.1 |
| CCl4 (g) | −95.98 |
| CCl4 (l) | −135.4 |
| CS2 (g) | 116.9 |
| CS2 (l) | 89.70 |
| HCN(g) | 135.1 |
| HCN(l) | 108.9 |
| HCO3− (aq) | −692.0 |
| Hydrocarbons |
| CH4 (g) | −74.87 |
| C2 H4 (g) | 52.47 |
| C2 H6(g) | −84.68 |
| C6 H6 (l) | 49.0 |
| Alcohols |
| CH3OH (l) | −238.7 |
| C2H5OH (l) | −277.7 |
| Aldehydes |
| HCHO(g) | −117 |
| CH3CHO(g) | −166.1 |
| CH3CHO(l) | −191.8 |
| Oxygen | Sulfur | Silver |
|---|
| O(g) | 249.2 | S(g) | 277.0 | Ag(s) | 0 |
| O2 (g) | 0 | S(s, monoclinic) | 0.360 | Ag+ (aq) | 105.6 |
| O3 (g) | 142.7 | S(s, rhombic) | 0 | AgBr(s) | −100.4 |
| OH- (aq) | −230.0 | S2 (g) | 128.6 | AgCl(s) | −127.1 |
| H2 O(g) | −241.8 | SO2 (g) | −296.8 | AgF(s) | −204.6 |
| H2 O(l) | −285.8 | H2S(g) | −20.50 | AgI(s) | −61.84 |
| Nitrogen | Sodium |
|---|
| N(g) | 472.7 | Na(g) | 107.3 |
| N2 (g) | 0 | Na(s) | 0 |
| NH3 (g) | −45.90 | Na+ (aq) | −240.1 |
| NH4 + (aq) | −132.5 | Na+ (g) | 609.3 |
| NO(g) | 90.29 | Na2CO3 (s) | −1130.8 |
| NO2 (g) | 33.10 | NaCl(s) | −411.1 |
| HNO3 (aq) | −207.4 | NaHCO3 (s) | −950.8 |
| Silicon | Hydrogen | Lead | Calcium |
|---|
| Si(s) | 0 | H(g) | 218.0 | Pb(s) | 0 | Ca(s) | 0 |
| SiCl4 (l) | −687.0 | H+ (aq) | 0 | Pb22+ (aq) | −1.7 | Ca2+ (aq) | −542.8 |
| SiF4 (g) | −1614.9 | H+ (g) | 1536.2 | PbO(s) | −219.4 | CaCO 3 (s, calcite) | −1206.9 |
| SiO2 (s, quartz) | −910.9 | H2 (g) | 0 | PbS(s) | −98.32 | CaO(s) | −635.1 |
| Name | T (K) | ΔfH° kJmol-1 |
|---|
ΔfG° kJmol-1 |
| NO(g) | 298 | 90.291 | 86.600 |
| NO2(g) | 298 | 33.095 | 51.258 |
| N2O4(g) | 298 | 9.079 | 97.787 |