NH3 + Na = H2 + NaNH2

ammonia + sodium ⟶ hydrogen + sodium amide

Balance the chemical equation algebraically: + ⟶ + Add stoichiometric coefficients, c_i, to the reactants and products: c_1 + c_2 ⟶ c_3 + c_4 Set the number of atoms in the reactants equal to the number of atoms in the products for H, N and Na: H: | 3 c_1 = 2 c_3 + 2 c_4 N: | c_1 = c_4 Na: | 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 = 2 c_3 = 1 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 2 + 2 ⟶ + 2

+ ⟶ +

ammonia + sodium ⟶ hydrogen + sodium amide

| ammonia | sodium | hydrogen | sodium amide molecular enthalpy | -45.9 kJ/mol | 0 kJ/mol | 0 kJ/mol | -123.8 kJ/mol total enthalpy | -91.8 kJ/mol | 0 kJ/mol | 0 kJ/mol | -247.6 kJ/mol | H_initial = -91.8 kJ/mol | | H_final = -247.6 kJ/mol | ΔH_rxn^0 | -247.6 kJ/mol - -91.8 kJ/mol = -155.8 kJ/mol (exothermic) | | |

| ammonia | sodium | hydrogen | sodium amide Hill formula | H_3N | Na | H_2 | H_2NNa name | ammonia | sodium | hydrogen | sodium amide IUPAC name | ammonia | sodium | molecular hydrogen | sodium azanide

| ammonia | sodium | hydrogen | sodium amide molar mass | 17.031 g/mol | 22.98976928 g/mol | 2.016 g/mol | 39.013 g/mol phase | gas (at STP) | solid (at STP) | gas (at STP) | solid (at STP) melting point | -77.73 °C | 97.8 °C | -259.2 °C | 210 °C boiling point | -33.33 °C | 883 °C | -252.8 °C | 400 °C density | 6.96×10^-4 g/cm^3 (at 25 °C) | 0.968 g/cm^3 | 8.99×10^-5 g/cm^3 (at 0 °C) | 1.39 g/cm^3 solubility in water | | decomposes | | reacts surface tension | 0.0234 N/m | | | dynamic viscosity | 1.009×10^-5 Pa s (at 25 °C) | 1.413×10^-5 Pa s (at 527 °C) | 8.9×10^-6 Pa s (at 25 °C) | odor | | | odorless |