Input interpretation
O_2 (oxygen) + Fe (iron) ⟶ FeO (iron(II) oxide)
Balanced equation
Balance the chemical equation algebraically: O_2 + Fe ⟶ FeO Add stoichiometric coefficients, c_i, to the reactants and products: c_1 O_2 + c_2 Fe ⟶ c_3 FeO 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_3 Fe: | c_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 = 2 c_3 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | O_2 + 2 Fe ⟶ 2 FeO
Structures
+ ⟶
Names
oxygen + iron ⟶ iron(II) oxide
Reaction thermodynamics
Enthalpy
| oxygen | iron | iron(II) oxide molecular enthalpy | 0 kJ/mol | 0 kJ/mol | -272 kJ/mol total enthalpy | 0 kJ/mol | 0 kJ/mol | -544 kJ/mol | H_initial = 0 kJ/mol | | H_final = -544 kJ/mol ΔH_rxn^0 | -544 kJ/mol - 0 kJ/mol = -544 kJ/mol (exothermic) | |
Entropy
| oxygen | iron | iron(II) oxide molecular entropy | 205 J/(mol K) | 27 J/(mol K) | 61 J/(mol K) total entropy | 205 J/(mol K) | 54 J/(mol K) | 122 J/(mol K) | S_initial = 259 J/(mol K) | | S_final = 122 J/(mol K) ΔS_rxn^0 | 122 J/(mol K) - 259 J/(mol K) = -137 J/(mol K) (exoentropic) | |
Equilibrium constant
![K_c = [FeO]^2/([O2] [Fe]^2)](../image_source/b80b4adb6fb8ba85818ed50b0a780b9a.png)
K_c = [FeO]^2/([O2] [Fe]^2)
Rate of reaction
![rate = -(Δ[O2])/(Δt) = -1/2 (Δ[Fe])/(Δt) = 1/2 (Δ[FeO])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)](../image_source/232c78252993cf952c68c976976e9d8b.png)
rate = -(Δ[O2])/(Δt) = -1/2 (Δ[Fe])/(Δt) = 1/2 (Δ[FeO])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| oxygen | iron | iron(II) oxide formula | O_2 | Fe | FeO name | oxygen | iron | iron(II) oxide IUPAC name | molecular oxygen | iron | oxoiron
Substance properties
| oxygen | iron | iron(II) oxide molar mass | 31.998 g/mol | 55.845 g/mol | 71.844 g/mol phase | gas (at STP) | solid (at STP) | solid (at STP) melting point | -218 °C | 1535 °C | 1360 °C boiling point | -183 °C | 2750 °C | density | 0.001429 g/cm^3 (at 0 °C) | 7.874 g/cm^3 | 5.7 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 | |
Units
