Mg + ZnCl2 = Zn + MgCl2

Mg (magnesium) + ZnCl_2 (zinc chloride) ⟶ Zn (zinc) + MgCl_2 (magnesium chloride)

Balance the chemical equation algebraically: Mg + ZnCl_2 ⟶ Zn + MgCl_2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Mg + c_2 ZnCl_2 ⟶ c_3 Zn + c_4 MgCl_2 Set the number of atoms in the reactants equal to the number of atoms in the products for Mg, Cl and Zn: Mg: | c_1 = c_4 Cl: | 2 c_2 = 2 c_4 Zn: | 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 c_4 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | Mg + ZnCl_2 ⟶ Zn + MgCl_2

+ ⟶ +

magnesium + zinc chloride ⟶ zinc + magnesium chloride

| magnesium | zinc chloride | zinc | magnesium chloride molecular enthalpy | 0 kJ/mol | -415.1 kJ/mol | 0 kJ/mol | -641.3 kJ/mol total enthalpy | 0 kJ/mol | -415.1 kJ/mol | 0 kJ/mol | -641.3 kJ/mol | H_initial = -415.1 kJ/mol | | H_final = -641.3 kJ/mol | ΔH_rxn^0 | -641.3 kJ/mol - -415.1 kJ/mol = -226.2 kJ/mol (exothermic) | | |

K_c = ([Zn] [MgCl2])/([Mg] [ZnCl2])

rate = -(Δ[Mg])/(Δt) = -(Δ[ZnCl2])/(Δt) = (Δ[Zn])/(Δt) = (Δ[MgCl2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| magnesium | zinc chloride | zinc | magnesium chloride formula | Mg | ZnCl_2 | Zn | MgCl_2 Hill formula | Mg | Cl_2Zn | Zn | Cl_2Mg name | magnesium | zinc chloride | zinc | magnesium chloride IUPAC name | magnesium | zinc dichloride | zinc | magnesium dichloride

| magnesium | zinc chloride | zinc | magnesium chloride molar mass | 24.305 g/mol | 136.3 g/mol | 65.38 g/mol | 95.2 g/mol phase | solid (at STP) | solid (at STP) | solid (at STP) | solid (at STP) melting point | 648 °C | 293 °C | 420 °C | 714 °C boiling point | 1090 °C | | 907 °C | density | 1.738 g/cm^3 | | 7.14 g/cm^3 | 2.32 g/cm^3 solubility in water | reacts | soluble | insoluble | soluble odor | | odorless | odorless |