Cu + HN3 = N2 + Cu(N3)2 + N4H4

copper + hydrazoic acid ⟶ nitrogen + copper(II) azide + ammonium azide

Balance the chemical equation algebraically: + ⟶ + + Add stoichiometric coefficients, c_i, to the reactants and products: c_1 + c_2 ⟶ c_3 + c_4 + c_5 Set the number of atoms in the reactants equal to the number of atoms in the products for Cu, H and N: Cu: | c_1 = c_4 H: | c_2 = 4 c_5 N: | 3 c_2 = 2 c_3 + 6 c_4 + 4 c_5 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_3 = c_2 - 3 c_4 = 1 c_5 = c_2/4 The resulting system of equations is still underdetermined, so an additional coefficient must be set arbitrarily. Set c_2 = 4 and solve for the remaining coefficients: c_1 = 1 c_2 = 4 c_3 = 1 c_4 = 1 c_5 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | + 4 ⟶ + +

+ ⟶ + +

copper + hydrazoic acid ⟶ nitrogen + copper(II) azide + ammonium azide

| copper | hydrazoic acid | nitrogen | copper(II) azide | ammonium azide Hill formula | Cu | HN_3 | N_2 | CuN_6 | H_4N_4 name | copper | hydrazoic acid | nitrogen | copper(II) azide | ammonium azide IUPAC name | copper | diazonioazanide | molecular nitrogen | copper diazide | azanium;azide

| copper | hydrazoic acid | nitrogen | copper(II) azide | ammonium azide molar mass | 63.546 g/mol | 43.029 g/mol | 28.014 g/mol | 147.59 g/mol | 60.06 g/mol phase | solid (at STP) | | gas (at STP) | | solid (at STP) melting point | 1083 °C | | -210 °C | | 160 °C boiling point | 2567 °C | | -195.79 °C | | density | 8.96 g/cm^3 | | 0.001251 g/cm^3 (at 0 °C) | | 1.346 g/cm^3 solubility in water | insoluble | | insoluble | | surface tension | | | 0.0066 N/m | | dynamic viscosity | | | 1.78×10^-5 Pa s (at 25 °C) | | odor | odorless | | odorless | |