Input interpretation
oxygen + hydrogen iodide ⟶ water + iodine
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 O, H and I: O: | 2 c_1 = c_3 H: | c_2 = 2 c_3 I: | c_2 = 2 c_4 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 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | + 4 ⟶ 2 + 2
Structures
+ ⟶ +
Names
oxygen + hydrogen iodide ⟶ water + iodine
Reaction thermodynamics
Enthalpy
| oxygen | hydrogen iodide | water | iodine molecular enthalpy | 0 kJ/mol | 26.5 kJ/mol | -285.8 kJ/mol | 0 kJ/mol total enthalpy | 0 kJ/mol | 106 kJ/mol | -571.7 kJ/mol | 0 kJ/mol | H_initial = 106 kJ/mol | | H_final = -571.7 kJ/mol | ΔH_rxn^0 | -571.7 kJ/mol - 106 kJ/mol = -677.7 kJ/mol (exothermic) | | |
Gibbs free energy
| oxygen | hydrogen iodide | water | iodine molecular free energy | 231.7 kJ/mol | 1.7 kJ/mol | -237.1 kJ/mol | 0 kJ/mol total free energy | 231.7 kJ/mol | 6.8 kJ/mol | -474.2 kJ/mol | 0 kJ/mol | G_initial = 238.5 kJ/mol | | G_final = -474.2 kJ/mol | ΔG_rxn^0 | -474.2 kJ/mol - 238.5 kJ/mol = -712.7 kJ/mol (exergonic) | | |
Chemical names and formulas
| oxygen | hydrogen iodide | water | iodine Hill formula | O_2 | HI | H_2O | I_2 name | oxygen | hydrogen iodide | water | iodine IUPAC name | molecular oxygen | hydrogen iodide | water | molecular iodine
Substance properties
| oxygen | hydrogen iodide | water | iodine molar mass | 31.998 g/mol | 127.912 g/mol | 18.015 g/mol | 253.80894 g/mol phase | gas (at STP) | gas (at STP) | liquid (at STP) | solid (at STP) melting point | -218 °C | -50.76 °C | 0 °C | 113 °C boiling point | -183 °C | -35.55 °C | 99.9839 °C | 184 °C density | 0.001429 g/cm^3 (at 0 °C) | 0.005228 g/cm^3 (at 25 °C) | 1 g/cm^3 | 4.94 g/cm^3 solubility in water | | very soluble | | surface tension | 0.01347 N/m | | 0.0728 N/m | dynamic viscosity | 2.055×10^-5 Pa s (at 25 °C) | 0.001321 Pa s (at -39 °C) | 8.9×10^-4 Pa s (at 25 °C) | 0.00227 Pa s (at 116 °C) odor | odorless | | odorless |
Units
