HCl + K = H2 + KCl

hydrogen chloride + potassium ⟶ hydrogen + potassium chloride

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 Cl, H and K: Cl: | c_1 = c_4 H: | c_1 = 2 c_3 K: | 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

+ ⟶ +

hydrogen chloride + potassium ⟶ hydrogen + potassium chloride

| hydrogen chloride | potassium | hydrogen | potassium chloride molecular entropy | 187 J/(mol K) | 64 J/(mol K) | 115 J/(mol K) | 83 J/(mol K) total entropy | 374 J/(mol K) | 128 J/(mol K) | 115 J/(mol K) | 166 J/(mol K) | S_initial = 502 J/(mol K) | | S_final = 281 J/(mol K) | ΔS_rxn^0 | 281 J/(mol K) - 502 J/(mol K) = -221 J/(mol K) (exoentropic) | | |

| hydrogen chloride | potassium | hydrogen | potassium chloride Hill formula | ClH | K | H_2 | ClK name | hydrogen chloride | potassium | hydrogen | potassium chloride IUPAC name | hydrogen chloride | potassium | molecular hydrogen | potassium chloride

| hydrogen chloride | potassium | hydrogen | potassium chloride molar mass | 36.46 g/mol | 39.0983 g/mol | 2.016 g/mol | 74.55 g/mol phase | gas (at STP) | solid (at STP) | gas (at STP) | solid (at STP) melting point | -114.17 °C | 64 °C | -259.2 °C | 770 °C boiling point | -85 °C | 760 °C | -252.8 °C | 1420 °C density | 0.00149 g/cm^3 (at 25 °C) | 0.86 g/cm^3 | 8.99×10^-5 g/cm^3 (at 0 °C) | 1.98 g/cm^3 solubility in water | miscible | reacts | | soluble dynamic viscosity | | | 8.9×10^-6 Pa s (at 25 °C) | odor | | | odorless | odorless