Input interpretation
manganese dioxide + hydrogen bromide ⟶ water + bromine + manganese(II) bromide
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 + c_5 Set the number of atoms in the reactants equal to the number of atoms in the products for Mn, O, Br and H: Mn: | c_1 = c_5 O: | 2 c_1 = c_3 Br: | c_2 = 2 c_4 + 2 c_5 H: | 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 c_4 = 1 c_5 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | + 4 ⟶ 2 + +
Structures
+ ⟶ + +
Names
manganese dioxide + hydrogen bromide ⟶ water + bromine + manganese(II) bromide
Reaction thermodynamics
Enthalpy
| manganese dioxide | hydrogen bromide | water | bromine | manganese(II) bromide molecular enthalpy | -520 kJ/mol | -36.3 kJ/mol | -285.8 kJ/mol | 0 kJ/mol | -384.9 kJ/mol total enthalpy | -520 kJ/mol | -145.2 kJ/mol | -571.7 kJ/mol | 0 kJ/mol | -384.9 kJ/mol | H_initial = -665.2 kJ/mol | | H_final = -956.6 kJ/mol | | ΔH_rxn^0 | -956.6 kJ/mol - -665.2 kJ/mol = -291.4 kJ/mol (exothermic) | | | |
Chemical names and formulas
| manganese dioxide | hydrogen bromide | water | bromine | manganese(II) bromide Hill formula | MnO_2 | BrH | H_2O | Br_2 | Br_2Mn name | manganese dioxide | hydrogen bromide | water | bromine | manganese(II) bromide IUPAC name | dioxomanganese | hydrogen bromide | water | molecular bromine | dibromomanganese