Input interpretation
oxygen + iron(II) oxide ⟶ iron(III) oxide
Balanced equation
Balance the chemical equation algebraically: + ⟶ Add stoichiometric coefficients, c_i, to the reactants and products: c_1 + c_2 ⟶ c_3 Set the number of atoms in the reactants equal to the number of atoms in the products for O and Fe: O: | 2 c_1 + c_2 = 3 c_3 Fe: | c_2 = 2 c_3 Since the coefficients are relative quantities and underdetermined, choose a coefficient to set arbitrarily. To keep the coefficients small, the arbitrary value is ordinarily one. For instance, set c_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 4 c_3 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | + 4 ⟶ 2
Structures
+ ⟶
Names
oxygen + iron(II) oxide ⟶ iron(III) oxide
Reaction thermodynamics
Enthalpy
| oxygen | iron(II) oxide | iron(III) oxide molecular enthalpy | 0 kJ/mol | -272 kJ/mol | -826 kJ/mol total enthalpy | 0 kJ/mol | -1088 kJ/mol | -1652 kJ/mol | H_initial = -1088 kJ/mol | | H_final = -1652 kJ/mol ΔH_rxn^0 | -1652 kJ/mol - -1088 kJ/mol = -564 kJ/mol (exothermic) | |
Gibbs free energy
| oxygen | iron(II) oxide | iron(III) oxide molecular free energy | 231.7 kJ/mol | -255 kJ/mol | -742.2 kJ/mol total free energy | 231.7 kJ/mol | -1020 kJ/mol | -1484 kJ/mol | G_initial = -788.3 kJ/mol | | G_final = -1484 kJ/mol ΔG_rxn^0 | -1484 kJ/mol - -788.3 kJ/mol = -696.1 kJ/mol (exergonic) | |
Entropy
| oxygen | iron(II) oxide | iron(III) oxide molecular entropy | 205 J/(mol K) | 61 J/(mol K) | 90 J/(mol K) total entropy | 205 J/(mol K) | 244 J/(mol K) | 180 J/(mol K) | S_initial = 449 J/(mol K) | | S_final = 180 J/(mol K) ΔS_rxn^0 | 180 J/(mol K) - 449 J/(mol K) = -269 J/(mol K) (exoentropic) | |
Chemical names and formulas
| oxygen | iron(II) oxide | iron(III) oxide Hill formula | O_2 | FeO | Fe_2O_3 name | oxygen | iron(II) oxide | iron(III) oxide IUPAC name | molecular oxygen | oxoiron |
Substance properties
| oxygen | iron(II) oxide | iron(III) oxide molar mass | 31.998 g/mol | 71.844 g/mol | 159.69 g/mol phase | gas (at STP) | solid (at STP) | solid (at STP) melting point | -218 °C | 1360 °C | 1565 °C boiling point | -183 °C | | density | 0.001429 g/cm^3 (at 0 °C) | 5.7 g/cm^3 | 5.26 g/cm^3 solubility in water | | insoluble | insoluble surface tension | 0.01347 N/m | | dynamic viscosity | 2.055×10^-5 Pa s (at 25 °C) | | odor | odorless | | odorless
Units
