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HNO3 + SiH4 = H2O + NO2 + SiO2

Input interpretation

HNO_3 nitric acid + SiH_4 silane ⟶ H_2O water + NO_2 nitrogen dioxide + SiO_2 silicon dioxide
HNO_3 nitric acid + SiH_4 silane ⟶ H_2O water + NO_2 nitrogen dioxide + SiO_2 silicon dioxide

Balanced equation

Balance the chemical equation algebraically: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HNO_3 + c_2 SiH_4 ⟶ c_3 H_2O + c_4 NO_2 + c_5 SiO_2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, N, O and Si: H: | c_1 + 4 c_2 = 2 c_3 N: | c_1 = c_4 O: | 3 c_1 = c_3 + 2 c_4 + 2 c_5 Si: | c_2 = c_5 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 = 8 c_2 = 1 c_3 = 6 c_4 = 8 c_5 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2
Balance the chemical equation algebraically: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HNO_3 + c_2 SiH_4 ⟶ c_3 H_2O + c_4 NO_2 + c_5 SiO_2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, N, O and Si: H: | c_1 + 4 c_2 = 2 c_3 N: | c_1 = c_4 O: | 3 c_1 = c_3 + 2 c_4 + 2 c_5 Si: | c_2 = c_5 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 = 8 c_2 = 1 c_3 = 6 c_4 = 8 c_5 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2

Structures

+ ⟶ + +
+ ⟶ + +

Names

nitric acid + silane ⟶ water + nitrogen dioxide + silicon dioxide
nitric acid + silane ⟶ water + nitrogen dioxide + silicon dioxide

Equilibrium constant

Construct the equilibrium constant, K, expression for: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 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: 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2 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 | 8 | -8 SiH_4 | 1 | -1 H_2O | 6 | 6 NO_2 | 8 | 8 SiO_2 | 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 | 8 | -8 | ([HNO3])^(-8) SiH_4 | 1 | -1 | ([SiH4])^(-1) H_2O | 6 | 6 | ([H2O])^6 NO_2 | 8 | 8 | ([NO2])^8 SiO_2 | 1 | 1 | [SiO2] 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])^(-8) ([SiH4])^(-1) ([H2O])^6 ([NO2])^8 [SiO2] = (([H2O])^6 ([NO2])^8 [SiO2])/(([HNO3])^8 [SiH4])
Construct the equilibrium constant, K, expression for: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 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: 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2 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 | 8 | -8 SiH_4 | 1 | -1 H_2O | 6 | 6 NO_2 | 8 | 8 SiO_2 | 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 | 8 | -8 | ([HNO3])^(-8) SiH_4 | 1 | -1 | ([SiH4])^(-1) H_2O | 6 | 6 | ([H2O])^6 NO_2 | 8 | 8 | ([NO2])^8 SiO_2 | 1 | 1 | [SiO2] 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])^(-8) ([SiH4])^(-1) ([H2O])^6 ([NO2])^8 [SiO2] = (([H2O])^6 ([NO2])^8 [SiO2])/(([HNO3])^8 [SiH4])

Rate of reaction

Construct the rate of reaction expression for: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 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: 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2 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 | 8 | -8 SiH_4 | 1 | -1 H_2O | 6 | 6 NO_2 | 8 | 8 SiO_2 | 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 | 8 | -8 | -1/8 (Δ[HNO3])/(Δt) SiH_4 | 1 | -1 | -(Δ[SiH4])/(Δt) H_2O | 6 | 6 | 1/6 (Δ[H2O])/(Δt) NO_2 | 8 | 8 | 1/8 (Δ[NO2])/(Δt) SiO_2 | 1 | 1 | (Δ[SiO2])/(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 = -1/8 (Δ[HNO3])/(Δt) = -(Δ[SiH4])/(Δt) = 1/6 (Δ[H2O])/(Δt) = 1/8 (Δ[NO2])/(Δt) = (Δ[SiO2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Construct the rate of reaction expression for: HNO_3 + SiH_4 ⟶ H_2O + NO_2 + SiO_2 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: 8 HNO_3 + SiH_4 ⟶ 6 H_2O + 8 NO_2 + SiO_2 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 | 8 | -8 SiH_4 | 1 | -1 H_2O | 6 | 6 NO_2 | 8 | 8 SiO_2 | 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 | 8 | -8 | -1/8 (Δ[HNO3])/(Δt) SiH_4 | 1 | -1 | -(Δ[SiH4])/(Δt) H_2O | 6 | 6 | 1/6 (Δ[H2O])/(Δt) NO_2 | 8 | 8 | 1/8 (Δ[NO2])/(Δt) SiO_2 | 1 | 1 | (Δ[SiO2])/(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 = -1/8 (Δ[HNO3])/(Δt) = -(Δ[SiH4])/(Δt) = 1/6 (Δ[H2O])/(Δt) = 1/8 (Δ[NO2])/(Δt) = (Δ[SiO2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

Chemical names and formulas

| nitric acid | silane | water | nitrogen dioxide | silicon dioxide formula | HNO_3 | SiH_4 | H_2O | NO_2 | SiO_2 Hill formula | HNO_3 | H_4Si | H_2O | NO_2 | O_2Si name | nitric acid | silane | water | nitrogen dioxide | silicon dioxide IUPAC name | nitric acid | silane | water | Nitrogen dioxide | dioxosilane
| nitric acid | silane | water | nitrogen dioxide | silicon dioxide formula | HNO_3 | SiH_4 | H_2O | NO_2 | SiO_2 Hill formula | HNO_3 | H_4Si | H_2O | NO_2 | O_2Si name | nitric acid | silane | water | nitrogen dioxide | silicon dioxide IUPAC name | nitric acid | silane | water | Nitrogen dioxide | dioxosilane

Substance properties

| nitric acid | silane | water | nitrogen dioxide | silicon dioxide molar mass | 63.012 g/mol | 32.117 g/mol | 18.015 g/mol | 46.005 g/mol | 60.083 g/mol phase | liquid (at STP) | gas (at STP) | liquid (at STP) | gas (at STP) | solid (at STP) melting point | -41.6 °C | -185 °C | 0 °C | -11 °C | 1713 °C boiling point | 83 °C | -112 °C | 99.9839 °C | 21 °C | 2950 °C density | 1.5129 g/cm^3 | 0.001313 g/cm^3 (at 25 °C) | 1 g/cm^3 | 0.00188 g/cm^3 (at 25 °C) | 2.196 g/cm^3 solubility in water | miscible | | | reacts | insoluble surface tension | | | 0.0728 N/m | | dynamic viscosity | 7.6×10^-4 Pa s (at 25 °C) | | 8.9×10^-4 Pa s (at 25 °C) | 4.02×10^-4 Pa s (at 25 °C) | odor | | | odorless | | odorless
| nitric acid | silane | water | nitrogen dioxide | silicon dioxide molar mass | 63.012 g/mol | 32.117 g/mol | 18.015 g/mol | 46.005 g/mol | 60.083 g/mol phase | liquid (at STP) | gas (at STP) | liquid (at STP) | gas (at STP) | solid (at STP) melting point | -41.6 °C | -185 °C | 0 °C | -11 °C | 1713 °C boiling point | 83 °C | -112 °C | 99.9839 °C | 21 °C | 2950 °C density | 1.5129 g/cm^3 | 0.001313 g/cm^3 (at 25 °C) | 1 g/cm^3 | 0.00188 g/cm^3 (at 25 °C) | 2.196 g/cm^3 solubility in water | miscible | | | reacts | insoluble surface tension | | | 0.0728 N/m | | dynamic viscosity | 7.6×10^-4 Pa s (at 25 °C) | | 8.9×10^-4 Pa s (at 25 °C) | 4.02×10^-4 Pa s (at 25 °C) | odor | | | odorless | | odorless

Units

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