NaSiO3 = SiO2 + NaO

NaSiO3 ⟶ SiO_2 silicon dioxide + NaO

Balance the chemical equation algebraically: NaSiO3 ⟶ SiO_2 + NaO Add stoichiometric coefficients, c_i, to the reactants and products: c_1 NaSiO3 ⟶ c_2 SiO_2 + c_3 NaO Set the number of atoms in the reactants equal to the number of atoms in the products for Na, Si and O: Na: | c_1 = c_3 Si: | c_1 = c_2 O: | 3 c_1 = 2 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: | | NaSiO3 ⟶ SiO_2 + NaO

NaSiO3 ⟶ + NaO

NaSiO3 ⟶ silicon dioxide + NaO

Construct the equilibrium constant, K, expression for: NaSiO3 ⟶ SiO_2 + NaO 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: NaSiO3 ⟶ SiO_2 + NaO 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 NaSiO3 | 1 | -1 SiO_2 | 1 | 1 NaO | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression NaSiO3 | 1 | -1 | ([NaSiO3])^(-1) SiO_2 | 1 | 1 | [SiO2] NaO | 1 | 1 | [NaO] 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 = ([NaSiO3])^(-1) [SiO2] [NaO] = ([SiO2] [NaO])/([NaSiO3])

Construct the rate of reaction expression for: NaSiO3 ⟶ SiO_2 + NaO 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: NaSiO3 ⟶ SiO_2 + NaO 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 NaSiO3 | 1 | -1 SiO_2 | 1 | 1 NaO | 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 NaSiO3 | 1 | -1 | -(Δ[NaSiO3])/(Δt) SiO_2 | 1 | 1 | (Δ[SiO2])/(Δt) NaO | 1 | 1 | (Δ[NaO])/(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[NaSiO3])/(Δt) = (Δ[SiO2])/(Δt) = (Δ[NaO])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| NaSiO3 | silicon dioxide | NaO formula | NaSiO3 | SiO_2 | NaO Hill formula | NaO3Si | O_2Si | NaO name | | silicon dioxide | IUPAC name | | dioxosilane |

| NaSiO3 | silicon dioxide | NaO molar mass | 99.072 g/mol | 60.083 g/mol | 38.989 g/mol phase | | solid (at STP) | melting point | | 1713 °C | boiling point | | 2950 °C | density | | 2.196 g/cm^3 | solubility in water | | insoluble | odor | | odorless |