NaNO2 = O2 + N2 + Na2O

NaNO_2 sodium nitrite ⟶ O_2 oxygen + N_2 nitrogen + Na_2O sodium oxide

Balance the chemical equation algebraically: NaNO_2 ⟶ O_2 + N_2 + Na_2O Add stoichiometric coefficients, c_i, to the reactants and products: c_1 NaNO_2 ⟶ c_2 O_2 + c_3 N_2 + c_4 Na_2O Set the number of atoms in the reactants equal to the number of atoms in the products for N, Na and O: N: | c_1 = 2 c_3 Na: | c_1 = 2 c_4 O: | 2 c_1 = 2 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_3 = 1 and solve the system of equations for the remaining coefficients: c_1 = 2 c_2 = 3/2 c_3 = 1 c_4 = 1 Multiply by the least common denominator, 2, to eliminate fractional coefficients: c_1 = 4 c_2 = 3 c_3 = 2 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 4 NaNO_2 ⟶ 3 O_2 + 2 N_2 + 2 Na_2O

⟶ + +

sodium nitrite ⟶ oxygen + nitrogen + sodium oxide

Construct the equilibrium constant, K, expression for: NaNO_2 ⟶ O_2 + N_2 + Na_2O 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: 4 NaNO_2 ⟶ 3 O_2 + 2 N_2 + 2 Na_2O 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 NaNO_2 | 4 | -4 O_2 | 3 | 3 N_2 | 2 | 2 Na_2O | 2 | 2 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression NaNO_2 | 4 | -4 | ([NaNO2])^(-4) O_2 | 3 | 3 | ([O2])^3 N_2 | 2 | 2 | ([N2])^2 Na_2O | 2 | 2 | ([Na2O])^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 = ([NaNO2])^(-4) ([O2])^3 ([N2])^2 ([Na2O])^2 = (([O2])^3 ([N2])^2 ([Na2O])^2)/([NaNO2])^4

Construct the rate of reaction expression for: NaNO_2 ⟶ O_2 + N_2 + Na_2O 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: 4 NaNO_2 ⟶ 3 O_2 + 2 N_2 + 2 Na_2O 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 NaNO_2 | 4 | -4 O_2 | 3 | 3 N_2 | 2 | 2 Na_2O | 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 NaNO_2 | 4 | -4 | -1/4 (Δ[NaNO2])/(Δt) O_2 | 3 | 3 | 1/3 (Δ[O2])/(Δt) N_2 | 2 | 2 | 1/2 (Δ[N2])/(Δt) Na_2O | 2 | 2 | 1/2 (Δ[Na2O])/(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 = -1/4 (Δ[NaNO2])/(Δt) = 1/3 (Δ[O2])/(Δt) = 1/2 (Δ[N2])/(Δt) = 1/2 (Δ[Na2O])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| sodium nitrite | oxygen | nitrogen | sodium oxide formula | NaNO_2 | O_2 | N_2 | Na_2O Hill formula | NNaO_2 | O_2 | N_2 | Na_2O name | sodium nitrite | oxygen | nitrogen | sodium oxide IUPAC name | sodium nitrite | molecular oxygen | molecular nitrogen | disodium oxygen(-2) anion

| sodium nitrite | oxygen | nitrogen | sodium oxide molar mass | 68.995 g/mol | 31.998 g/mol | 28.014 g/mol | 61.979 g/mol phase | solid (at STP) | gas (at STP) | gas (at STP) | melting point | 271 °C | -218 °C | -210 °C | boiling point | | -183 °C | -195.79 °C | density | 2.168 g/cm^3 | 0.001429 g/cm^3 (at 0 °C) | 0.001251 g/cm^3 (at 0 °C) | 2.27 g/cm^3 solubility in water | | | insoluble | surface tension | | 0.01347 N/m | 0.0066 N/m | dynamic viscosity | | 2.055×10^-5 Pa s (at 25 °C) | 1.78×10^-5 Pa s (at 25 °C) | odor | | odorless | odorless |