Input interpretation
hydrogen + iron(II, III) oxide ⟶ water + iron
Balanced equation
Balance the chemical equation algebraically: + ⟶ + Add stoichiometric coefficients, c_i, to the reactants and products: c_1 + c_2 ⟶ c_3 + c_4 Set the number of atoms in the reactants equal to the number of atoms in the products for H, Fe and O: H: | 2 c_1 = 2 c_3 Fe: | 3 c_2 = c_4 O: | 4 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_2 = 1 and solve the system of equations for the remaining coefficients: c_1 = 4 c_2 = 1 c_3 = 4 c_4 = 3 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 4 + ⟶ 4 + 3
Structures
+ ⟶ +
Names
hydrogen + iron(II, III) oxide ⟶ water + iron
Reaction thermodynamics
Enthalpy
| hydrogen | iron(II, III) oxide | water | iron molecular enthalpy | 0 kJ/mol | -1118 kJ/mol | -285.8 kJ/mol | 0 kJ/mol total enthalpy | 0 kJ/mol | -1118 kJ/mol | -1143 kJ/mol | 0 kJ/mol | H_initial = -1118 kJ/mol | | H_final = -1143 kJ/mol | ΔH_rxn^0 | -1143 kJ/mol - -1118 kJ/mol = -24.92 kJ/mol (exothermic) | | |
Chemical names and formulas
| hydrogen | iron(II, III) oxide | water | iron Hill formula | H_2 | Fe_3O_4 | H_2O | Fe name | hydrogen | iron(II, III) oxide | water | iron IUPAC name | molecular hydrogen | | water | iron
Substance properties
| hydrogen | iron(II, III) oxide | water | iron molar mass | 2.016 g/mol | 231.53 g/mol | 18.015 g/mol | 55.845 g/mol phase | gas (at STP) | solid (at STP) | liquid (at STP) | solid (at STP) melting point | -259.2 °C | 1538 °C | 0 °C | 1535 °C boiling point | -252.8 °C | | 99.9839 °C | 2750 °C density | 8.99×10^-5 g/cm^3 (at 0 °C) | 5 g/cm^3 | 1 g/cm^3 | 7.874 g/cm^3 solubility in water | | | | insoluble surface tension | | | 0.0728 N/m | dynamic viscosity | 8.9×10^-6 Pa s (at 25 °C) | | 8.9×10^-4 Pa s (at 25 °C) | odor | odorless | | odorless |
Units
