Input interpretation
H_2SO_4 sulfuric acid + Al4C3 ⟶ Al_2(SO_4)_3 aluminum sulfate + CH_4 methane
Balanced equation
Balance the chemical equation algebraically: H_2SO_4 + Al4C3 ⟶ Al_2(SO_4)_3 + CH_4 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 H_2SO_4 + c_2 Al4C3 ⟶ c_3 Al_2(SO_4)_3 + c_4 CH_4 Set the number of atoms in the reactants equal to the number of atoms in the products for H, O, S, Al and C: H: | 2 c_1 = 4 c_4 O: | 4 c_1 = 12 c_3 S: | c_1 = 3 c_3 Al: | 4 c_2 = 2 c_3 C: | 3 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 = 2 c_4 = 3 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 6 H_2SO_4 + Al4C3 ⟶ 2 Al_2(SO_4)_3 + 3 CH_4
Structures
+ Al4C3 ⟶ +
Names
sulfuric acid + Al4C3 ⟶ aluminum sulfate + methane
Equilibrium constant
Construct the equilibrium constant, K, expression for: H_2SO_4 + Al4C3 ⟶ Al_2(SO_4)_3 + CH_4 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 H_2SO_4 + Al4C3 ⟶ 2 Al_2(SO_4)_3 + 3 CH_4 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 H_2SO_4 | 6 | -6 Al4C3 | 1 | -1 Al_2(SO_4)_3 | 2 | 2 CH_4 | 3 | 3 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression H_2SO_4 | 6 | -6 | ([H2SO4])^(-6) Al4C3 | 1 | -1 | ([Al4C3])^(-1) Al_2(SO_4)_3 | 2 | 2 | ([Al2(SO4)3])^2 CH_4 | 3 | 3 | ([CH4])^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 = ([H2SO4])^(-6) ([Al4C3])^(-1) ([Al2(SO4)3])^2 ([CH4])^3 = (([Al2(SO4)3])^2 ([CH4])^3)/(([H2SO4])^6 [Al4C3])
Rate of reaction
Construct the rate of reaction expression for: H_2SO_4 + Al4C3 ⟶ Al_2(SO_4)_3 + CH_4 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 H_2SO_4 + Al4C3 ⟶ 2 Al_2(SO_4)_3 + 3 CH_4 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 H_2SO_4 | 6 | -6 Al4C3 | 1 | -1 Al_2(SO_4)_3 | 2 | 2 CH_4 | 3 | 3 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 H_2SO_4 | 6 | -6 | -1/6 (Δ[H2SO4])/(Δt) Al4C3 | 1 | -1 | -(Δ[Al4C3])/(Δt) Al_2(SO_4)_3 | 2 | 2 | 1/2 (Δ[Al2(SO4)3])/(Δt) CH_4 | 3 | 3 | 1/3 (Δ[CH4])/(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[H2SO4])/(Δt) = -(Δ[Al4C3])/(Δt) = 1/2 (Δ[Al2(SO4)3])/(Δt) = 1/3 (Δ[CH4])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| sulfuric acid | Al4C3 | aluminum sulfate | methane formula | H_2SO_4 | Al4C3 | Al_2(SO_4)_3 | CH_4 Hill formula | H_2O_4S | C3Al4 | Al_2O_12S_3 | CH_4 name | sulfuric acid | | aluminum sulfate | methane IUPAC name | sulfuric acid | | dialuminum trisulfate | methane
Substance properties
| sulfuric acid | Al4C3 | aluminum sulfate | methane molar mass | 98.07 g/mol | 143.959 g/mol | 342.1 g/mol | 16.04 g/mol phase | liquid (at STP) | | solid (at STP) | gas (at STP) melting point | 10.371 °C | | 770 °C | -182.47 °C boiling point | 279.6 °C | | | -161.48 °C density | 1.8305 g/cm^3 | | 2.71 g/cm^3 | 6.67151×10^-4 g/cm^3 (at 20 °C) solubility in water | very soluble | | soluble | soluble surface tension | 0.0735 N/m | | | 0.0137 N/m dynamic viscosity | 0.021 Pa s (at 25 °C) | | | 1.114×10^-5 Pa s (at 25 °C) odor | odorless | | | odorless
Units