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HNO3 + FeS = H2O + SO2 + NO2 + Fe(NO3)3

Input interpretation

HNO_3 nitric acid + FeS ferrous sulfide ⟶ H_2O water + SO_2 sulfur dioxide + NO_2 nitrogen dioxide + Fe(NO_3)_3 ferric nitrate
HNO_3 nitric acid + FeS ferrous sulfide ⟶ H_2O water + SO_2 sulfur dioxide + NO_2 nitrogen dioxide + Fe(NO_3)_3 ferric nitrate

Balanced equation

Balance the chemical equation algebraically: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HNO_3 + c_2 FeS ⟶ c_3 H_2O + c_4 SO_2 + c_5 NO_2 + c_6 Fe(NO_3)_3 Set the number of atoms in the reactants equal to the number of atoms in the products for H, N, O, Fe and S: H: | c_1 = 2 c_3 N: | c_1 = c_5 + 3 c_6 O: | 3 c_1 = c_3 + 2 c_4 + 2 c_5 + 9 c_6 Fe: | c_2 = c_6 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 = 10 c_2 = 1 c_3 = 5 c_4 = 1 c_5 = 7 c_6 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3
Balance the chemical equation algebraically: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HNO_3 + c_2 FeS ⟶ c_3 H_2O + c_4 SO_2 + c_5 NO_2 + c_6 Fe(NO_3)_3 Set the number of atoms in the reactants equal to the number of atoms in the products for H, N, O, Fe and S: H: | c_1 = 2 c_3 N: | c_1 = c_5 + 3 c_6 O: | 3 c_1 = c_3 + 2 c_4 + 2 c_5 + 9 c_6 Fe: | c_2 = c_6 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 = 10 c_2 = 1 c_3 = 5 c_4 = 1 c_5 = 7 c_6 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3

Structures

+ ⟶ + + +
+ ⟶ + + +

Names

nitric acid + ferrous sulfide ⟶ water + sulfur dioxide + nitrogen dioxide + ferric nitrate
nitric acid + ferrous sulfide ⟶ water + sulfur dioxide + nitrogen dioxide + ferric nitrate

Equilibrium constant

Construct the equilibrium constant, K, expression for: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the activity expression for each chemical species. • Use the activity expressions to build the equilibrium constant expression. Write the balanced chemical equation: 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i HNO_3 | 10 | -10 FeS | 1 | -1 H_2O | 5 | 5 SO_2 | 1 | 1 NO_2 | 7 | 7 Fe(NO_3)_3 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression HNO_3 | 10 | -10 | ([HNO3])^(-10) FeS | 1 | -1 | ([FeS])^(-1) H_2O | 5 | 5 | ([H2O])^5 SO_2 | 1 | 1 | [SO2] NO_2 | 7 | 7 | ([NO2])^7 Fe(NO_3)_3 | 1 | 1 | [Fe(NO3)3] The equilibrium constant symbol in the concentration basis is: K_c Mulitply the activity expressions to arrive at the K_c expression: Answer: | | K_c = ([HNO3])^(-10) ([FeS])^(-1) ([H2O])^5 [SO2] ([NO2])^7 [Fe(NO3)3] = (([H2O])^5 [SO2] ([NO2])^7 [Fe(NO3)3])/(([HNO3])^10 [FeS])
Construct the equilibrium constant, K, expression for: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the activity expression for each chemical species. • Use the activity expressions to build the equilibrium constant expression. Write the balanced chemical equation: 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i HNO_3 | 10 | -10 FeS | 1 | -1 H_2O | 5 | 5 SO_2 | 1 | 1 NO_2 | 7 | 7 Fe(NO_3)_3 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression HNO_3 | 10 | -10 | ([HNO3])^(-10) FeS | 1 | -1 | ([FeS])^(-1) H_2O | 5 | 5 | ([H2O])^5 SO_2 | 1 | 1 | [SO2] NO_2 | 7 | 7 | ([NO2])^7 Fe(NO_3)_3 | 1 | 1 | [Fe(NO3)3] The equilibrium constant symbol in the concentration basis is: K_c Mulitply the activity expressions to arrive at the K_c expression: Answer: | | K_c = ([HNO3])^(-10) ([FeS])^(-1) ([H2O])^5 [SO2] ([NO2])^7 [Fe(NO3)3] = (([H2O])^5 [SO2] ([NO2])^7 [Fe(NO3)3])/(([HNO3])^10 [FeS])

Rate of reaction

Construct the rate of reaction expression for: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the rate term for each chemical species. • Write the rate of reaction expression. Write the balanced chemical equation: 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i HNO_3 | 10 | -10 FeS | 1 | -1 H_2O | 5 | 5 SO_2 | 1 | 1 NO_2 | 7 | 7 Fe(NO_3)_3 | 1 | 1 The rate term for each chemical species, B_i, is 1/ν_i(Δ[B_i])/(Δt) where [B_i] is the amount concentration and t is time: chemical species | c_i | ν_i | rate term HNO_3 | 10 | -10 | -1/10 (Δ[HNO3])/(Δt) FeS | 1 | -1 | -(Δ[FeS])/(Δt) H_2O | 5 | 5 | 1/5 (Δ[H2O])/(Δt) SO_2 | 1 | 1 | (Δ[SO2])/(Δt) NO_2 | 7 | 7 | 1/7 (Δ[NO2])/(Δt) Fe(NO_3)_3 | 1 | 1 | (Δ[Fe(NO3)3])/(Δt) (for infinitesimal rate of change, replace Δ with d) Set the rate terms equal to each other to arrive at the rate expression: Answer: | | rate = -1/10 (Δ[HNO3])/(Δt) = -(Δ[FeS])/(Δt) = 1/5 (Δ[H2O])/(Δt) = (Δ[SO2])/(Δt) = 1/7 (Δ[NO2])/(Δt) = (Δ[Fe(NO3)3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Construct the rate of reaction expression for: HNO_3 + FeS ⟶ H_2O + SO_2 + NO_2 + Fe(NO_3)_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the rate term for each chemical species. • Write the rate of reaction expression. Write the balanced chemical equation: 10 HNO_3 + FeS ⟶ 5 H_2O + SO_2 + 7 NO_2 + Fe(NO_3)_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i HNO_3 | 10 | -10 FeS | 1 | -1 H_2O | 5 | 5 SO_2 | 1 | 1 NO_2 | 7 | 7 Fe(NO_3)_3 | 1 | 1 The rate term for each chemical species, B_i, is 1/ν_i(Δ[B_i])/(Δt) where [B_i] is the amount concentration and t is time: chemical species | c_i | ν_i | rate term HNO_3 | 10 | -10 | -1/10 (Δ[HNO3])/(Δt) FeS | 1 | -1 | -(Δ[FeS])/(Δt) H_2O | 5 | 5 | 1/5 (Δ[H2O])/(Δt) SO_2 | 1 | 1 | (Δ[SO2])/(Δt) NO_2 | 7 | 7 | 1/7 (Δ[NO2])/(Δt) Fe(NO_3)_3 | 1 | 1 | (Δ[Fe(NO3)3])/(Δt) (for infinitesimal rate of change, replace Δ with d) Set the rate terms equal to each other to arrive at the rate expression: Answer: | | rate = -1/10 (Δ[HNO3])/(Δt) = -(Δ[FeS])/(Δt) = 1/5 (Δ[H2O])/(Δt) = (Δ[SO2])/(Δt) = 1/7 (Δ[NO2])/(Δt) = (Δ[Fe(NO3)3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

Chemical names and formulas

| nitric acid | ferrous sulfide | water | sulfur dioxide | nitrogen dioxide | ferric nitrate formula | HNO_3 | FeS | H_2O | SO_2 | NO_2 | Fe(NO_3)_3 Hill formula | HNO_3 | FeS | H_2O | O_2S | NO_2 | FeN_3O_9 name | nitric acid | ferrous sulfide | water | sulfur dioxide | nitrogen dioxide | ferric nitrate IUPAC name | nitric acid | | water | sulfur dioxide | Nitrogen dioxide | iron(+3) cation trinitrate
| nitric acid | ferrous sulfide | water | sulfur dioxide | nitrogen dioxide | ferric nitrate formula | HNO_3 | FeS | H_2O | SO_2 | NO_2 | Fe(NO_3)_3 Hill formula | HNO_3 | FeS | H_2O | O_2S | NO_2 | FeN_3O_9 name | nitric acid | ferrous sulfide | water | sulfur dioxide | nitrogen dioxide | ferric nitrate IUPAC name | nitric acid | | water | sulfur dioxide | Nitrogen dioxide | iron(+3) cation trinitrate

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