ZnO + SO3 = ZnSO4

ZnO zinc oxide + SO_3 sulfur trioxide ⟶ ZnSO_4 zinc sulfate

Balance the chemical equation algebraically: ZnO + SO_3 ⟶ ZnSO_4 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 ZnO + c_2 SO_3 ⟶ c_3 ZnSO_4 Set the number of atoms in the reactants equal to the number of atoms in the products for O, Zn and S: O: | c_1 + 3 c_2 = 4 c_3 Zn: | c_1 = c_3 S: | c_2 = c_3 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_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 1 c_3 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | ZnO + SO_3 ⟶ ZnSO_4

+ ⟶

zinc oxide + sulfur trioxide ⟶ zinc sulfate

Construct the equilibrium constant, K, expression for: ZnO + SO_3 ⟶ ZnSO_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: ZnO + SO_3 ⟶ ZnSO_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 ZnO | 1 | -1 SO_3 | 1 | -1 ZnSO_4 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression ZnO | 1 | -1 | ([ZnO])^(-1) SO_3 | 1 | -1 | ([SO3])^(-1) ZnSO_4 | 1 | 1 | [ZnSO4] 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 = ([ZnO])^(-1) ([SO3])^(-1) [ZnSO4] = ([ZnSO4])/([ZnO] [SO3])

Construct the rate of reaction expression for: ZnO + SO_3 ⟶ ZnSO_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: ZnO + SO_3 ⟶ ZnSO_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 ZnO | 1 | -1 SO_3 | 1 | -1 ZnSO_4 | 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 ZnO | 1 | -1 | -(Δ[ZnO])/(Δt) SO_3 | 1 | -1 | -(Δ[SO3])/(Δt) ZnSO_4 | 1 | 1 | (Δ[ZnSO4])/(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 = -(Δ[ZnO])/(Δt) = -(Δ[SO3])/(Δt) = (Δ[ZnSO4])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| zinc oxide | sulfur trioxide | zinc sulfate formula | ZnO | SO_3 | ZnSO_4 Hill formula | OZn | O_3S | O_4SZn name | zinc oxide | sulfur trioxide | zinc sulfate IUPAC name | oxozinc | sulfur trioxide | zinc sulfate

| zinc oxide | sulfur trioxide | zinc sulfate molar mass | 81.38 g/mol | 80.06 g/mol | 161.4 g/mol phase | solid (at STP) | liquid (at STP) | melting point | 1975 °C | 16.8 °C | boiling point | 2360 °C | 44.7 °C | density | 5.6 g/cm^3 | 1.97 g/cm^3 | 1.005 g/cm^3 solubility in water | | reacts | soluble dynamic viscosity | | 0.00159 Pa s (at 30 °C) | odor | odorless | | odorless