Na2O + BeO = Na2BeO2

Na_2O sodium oxide + BeO beryllium oxide ⟶ Na2BeO2

Balance the chemical equation algebraically: Na_2O + BeO ⟶ Na2BeO2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Na_2O + c_2 BeO ⟶ c_3 Na2BeO2 Set the number of atoms in the reactants equal to the number of atoms in the products for Na, O and Be: Na: | 2 c_1 = 2 c_3 O: | c_1 + c_2 = 2 c_3 Be: | 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: | | Na_2O + BeO ⟶ Na2BeO2

+ ⟶ Na2BeO2

sodium oxide + beryllium oxide ⟶ Na2BeO2

Construct the equilibrium constant, K, expression for: Na_2O + BeO ⟶ Na2BeO2 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: Na_2O + BeO ⟶ Na2BeO2 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 Na_2O | 1 | -1 BeO | 1 | -1 Na2BeO2 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression Na_2O | 1 | -1 | ([Na2O])^(-1) BeO | 1 | -1 | ([BeO])^(-1) Na2BeO2 | 1 | 1 | [Na2BeO2] 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 = ([Na2O])^(-1) ([BeO])^(-1) [Na2BeO2] = ([Na2BeO2])/([Na2O] [BeO])

Construct the rate of reaction expression for: Na_2O + BeO ⟶ Na2BeO2 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: Na_2O + BeO ⟶ Na2BeO2 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 Na_2O | 1 | -1 BeO | 1 | -1 Na2BeO2 | 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 Na_2O | 1 | -1 | -(Δ[Na2O])/(Δt) BeO | 1 | -1 | -(Δ[BeO])/(Δt) Na2BeO2 | 1 | 1 | (Δ[Na2BeO2])/(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[Na2O])/(Δt) = -(Δ[BeO])/(Δt) = (Δ[Na2BeO2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| sodium oxide | beryllium oxide | Na2BeO2 formula | Na_2O | BeO | Na2BeO2 Hill formula | Na_2O | BeO | BeNa2O2 name | sodium oxide | beryllium oxide | IUPAC name | disodium oxygen(-2) anion | oxoberyllium |

| sodium oxide | beryllium oxide | Na2BeO2 molar mass | 61.979 g/mol | 25.011 g/mol | 86.99 g/mol phase | | solid (at STP) | melting point | | 2410 °C | boiling point | | 4300 °C | density | 2.27 g/cm^3 | 3.01 g/cm^3 | solubility in water | | insoluble |