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HCl + Al = H2 + Al2Cl3

Input interpretation

HCl hydrogen chloride + Al aluminum ⟶ H_2 hydrogen + Al2Cl3
HCl hydrogen chloride + Al aluminum ⟶ H_2 hydrogen + Al2Cl3

Balanced equation

Balance the chemical equation algebraically: HCl + Al ⟶ H_2 + Al2Cl3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HCl + c_2 Al ⟶ c_3 H_2 + c_4 Al2Cl3 Set the number of atoms in the reactants equal to the number of atoms in the products for Cl, H and Al: Cl: | c_1 = 3 c_4 H: | c_1 = 2 c_3 Al: | 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_4 = 1 and solve the system of equations for the remaining coefficients: c_1 = 3 c_2 = 2 c_3 = 3/2 c_4 = 1 Multiply by the least common denominator, 2, to eliminate fractional coefficients: c_1 = 6 c_2 = 4 c_3 = 3 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3
Balance the chemical equation algebraically: HCl + Al ⟶ H_2 + Al2Cl3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 HCl + c_2 Al ⟶ c_3 H_2 + c_4 Al2Cl3 Set the number of atoms in the reactants equal to the number of atoms in the products for Cl, H and Al: Cl: | c_1 = 3 c_4 H: | c_1 = 2 c_3 Al: | 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_4 = 1 and solve the system of equations for the remaining coefficients: c_1 = 3 c_2 = 2 c_3 = 3/2 c_4 = 1 Multiply by the least common denominator, 2, to eliminate fractional coefficients: c_1 = 6 c_2 = 4 c_3 = 3 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3

Structures

+ ⟶ + Al2Cl3
+ ⟶ + Al2Cl3

Names

hydrogen chloride + aluminum ⟶ hydrogen + Al2Cl3
hydrogen chloride + aluminum ⟶ hydrogen + Al2Cl3

Equilibrium constant

Construct the equilibrium constant, K, expression for: HCl + Al ⟶ H_2 + Al2Cl3 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: 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3 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 HCl | 6 | -6 Al | 4 | -4 H_2 | 3 | 3 Al2Cl3 | 2 | 2 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression HCl | 6 | -6 | ([HCl])^(-6) Al | 4 | -4 | ([Al])^(-4) H_2 | 3 | 3 | ([H2])^3 Al2Cl3 | 2 | 2 | ([Al2Cl3])^2 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 = ([HCl])^(-6) ([Al])^(-4) ([H2])^3 ([Al2Cl3])^2 = (([H2])^3 ([Al2Cl3])^2)/(([HCl])^6 ([Al])^4)
Construct the equilibrium constant, K, expression for: HCl + Al ⟶ H_2 + Al2Cl3 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: 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3 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 HCl | 6 | -6 Al | 4 | -4 H_2 | 3 | 3 Al2Cl3 | 2 | 2 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression HCl | 6 | -6 | ([HCl])^(-6) Al | 4 | -4 | ([Al])^(-4) H_2 | 3 | 3 | ([H2])^3 Al2Cl3 | 2 | 2 | ([Al2Cl3])^2 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 = ([HCl])^(-6) ([Al])^(-4) ([H2])^3 ([Al2Cl3])^2 = (([H2])^3 ([Al2Cl3])^2)/(([HCl])^6 ([Al])^4)

Rate of reaction

Construct the rate of reaction expression for: HCl + Al ⟶ H_2 + Al2Cl3 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: 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3 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 HCl | 6 | -6 Al | 4 | -4 H_2 | 3 | 3 Al2Cl3 | 2 | 2 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 HCl | 6 | -6 | -1/6 (Δ[HCl])/(Δt) Al | 4 | -4 | -1/4 (Δ[Al])/(Δt) H_2 | 3 | 3 | 1/3 (Δ[H2])/(Δt) Al2Cl3 | 2 | 2 | 1/2 (Δ[Al2Cl3])/(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 = -1/6 (Δ[HCl])/(Δt) = -1/4 (Δ[Al])/(Δt) = 1/3 (Δ[H2])/(Δt) = 1/2 (Δ[Al2Cl3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Construct the rate of reaction expression for: HCl + Al ⟶ H_2 + Al2Cl3 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: 6 HCl + 4 Al ⟶ 3 H_2 + 2 Al2Cl3 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 HCl | 6 | -6 Al | 4 | -4 H_2 | 3 | 3 Al2Cl3 | 2 | 2 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 HCl | 6 | -6 | -1/6 (Δ[HCl])/(Δt) Al | 4 | -4 | -1/4 (Δ[Al])/(Δt) H_2 | 3 | 3 | 1/3 (Δ[H2])/(Δt) Al2Cl3 | 2 | 2 | 1/2 (Δ[Al2Cl3])/(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 = -1/6 (Δ[HCl])/(Δt) = -1/4 (Δ[Al])/(Δt) = 1/3 (Δ[H2])/(Δt) = 1/2 (Δ[Al2Cl3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

Chemical names and formulas

| hydrogen chloride | aluminum | hydrogen | Al2Cl3 formula | HCl | Al | H_2 | Al2Cl3 Hill formula | ClH | Al | H_2 | Al2Cl3 name | hydrogen chloride | aluminum | hydrogen | IUPAC name | hydrogen chloride | aluminum | molecular hydrogen |
| hydrogen chloride | aluminum | hydrogen | Al2Cl3 formula | HCl | Al | H_2 | Al2Cl3 Hill formula | ClH | Al | H_2 | Al2Cl3 name | hydrogen chloride | aluminum | hydrogen | IUPAC name | hydrogen chloride | aluminum | molecular hydrogen |

Substance properties

| hydrogen chloride | aluminum | hydrogen | Al2Cl3 molar mass | 36.46 g/mol | 26.9815385 g/mol | 2.016 g/mol | 160.3 g/mol phase | gas (at STP) | solid (at STP) | gas (at STP) | melting point | -114.17 °C | 660.4 °C | -259.2 °C | boiling point | -85 °C | 2460 °C | -252.8 °C | density | 0.00149 g/cm^3 (at 25 °C) | 2.7 g/cm^3 | 8.99×10^-5 g/cm^3 (at 0 °C) | solubility in water | miscible | insoluble | | surface tension | | 0.817 N/m | | dynamic viscosity | | 1.5×10^-4 Pa s (at 760 °C) | 8.9×10^-6 Pa s (at 25 °C) | odor | | odorless | odorless |
| hydrogen chloride | aluminum | hydrogen | Al2Cl3 molar mass | 36.46 g/mol | 26.9815385 g/mol | 2.016 g/mol | 160.3 g/mol phase | gas (at STP) | solid (at STP) | gas (at STP) | melting point | -114.17 °C | 660.4 °C | -259.2 °C | boiling point | -85 °C | 2460 °C | -252.8 °C | density | 0.00149 g/cm^3 (at 25 °C) | 2.7 g/cm^3 | 8.99×10^-5 g/cm^3 (at 0 °C) | solubility in water | miscible | insoluble | | surface tension | | 0.817 N/m | | dynamic viscosity | | 1.5×10^-4 Pa s (at 760 °C) | 8.9×10^-6 Pa s (at 25 °C) | odor | | odorless | odorless |

Units

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