Input interpretation
nitric acid + hydrogen sulfide ⟶ water + sulfur dioxide + nitrogen dioxide
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 H, N, O and S: H: | c_1 + 2 c_2 = 2 c_3 N: | c_1 = c_5 O: | 3 c_1 = c_3 + 2 c_4 + 2 c_5 S: | c_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_2 = 1 and solve the system of equations for the remaining coefficients: c_1 = 6 c_2 = 1 c_3 = 4 c_4 = 1 c_5 = 6 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 6 + ⟶ 4 + + 6
Structures
+ ⟶ + +
Names
nitric acid + hydrogen sulfide ⟶ water + sulfur dioxide + nitrogen dioxide
Reaction thermodynamics
Gibbs free energy
| nitric acid | hydrogen sulfide | water | sulfur dioxide | nitrogen dioxide molecular free energy | -80.7 kJ/mol | -33.4 kJ/mol | -237.1 kJ/mol | -300.1 kJ/mol | 51.3 kJ/mol total free energy | -484.2 kJ/mol | -33.4 kJ/mol | -948.4 kJ/mol | -300.1 kJ/mol | 307.8 kJ/mol | G_initial = -517.6 kJ/mol | | G_final = -940.7 kJ/mol | | ΔG_rxn^0 | -940.7 kJ/mol - -517.6 kJ/mol = -423.1 kJ/mol (exergonic) | | | |
Entropy
| nitric acid | hydrogen sulfide | water | sulfur dioxide | nitrogen dioxide molecular entropy | 156 J/(mol K) | 206 J/(mol K) | 69.91 J/(mol K) | 248 J/(mol K) | 240 J/(mol K) total entropy | 936 J/(mol K) | 206 J/(mol K) | 279.6 J/(mol K) | 248 J/(mol K) | 1440 J/(mol K) | S_initial = 1142 J/(mol K) | | S_final = 1968 J/(mol K) | | ΔS_rxn^0 | 1968 J/(mol K) - 1142 J/(mol K) = 825.6 J/(mol K) (endoentropic) | | | |
Chemical names and formulas
| nitric acid | hydrogen sulfide | water | sulfur dioxide | nitrogen dioxide Hill formula | HNO_3 | H_2S | H_2O | O_2S | NO_2 name | nitric acid | hydrogen sulfide | water | sulfur dioxide | nitrogen dioxide IUPAC name | nitric acid | hydrogen sulfide | water | sulfur dioxide | Nitrogen dioxide