Consider a closed container with Cu(s), CuO(s), SO2(g), SO3(g), and O2(g) at 800 K.  When this system reaches equilibrium, there are 3 simultaneous chemical equilibria: (i)          2 Cu(s) + O2(g) ⇌ 2 CuO(s)                                               Kc(i) = 1.51 × 108(ii)         CuO(s) + SO2(g) ⇌ Cu(s) + SO3(g)                                Kc(ii) = 6.38 × 10–6(iii)       2 SO2(g) + O2(g) ⇌ 2 SO3(g)                                               Kc(iii) = ? Determine the value of the equilibrium constant Kc(iii) at 800 K.    1.56 × 105        6.87 × 10–12     Correct Answer    6.15 × 10–3     You Answered    1.51 × 108

In a solution with carbon tetrachloride as the solvent, the compound VCl4. undergoes dimerization: 2VCl4V2Cl8 When 6.6834 g VCl4. is dissolved in 100.0 g carbon tetrachloride, the freezing point is lowered by 5.97C. Calculate the value of the equilibrium constant for the dimerization of VCl4 at this temperature. (The density of the equilibrium mixture is 1.696 g/cm3, and Kf = 29.8C kg/mol for CCl4.)

The decomposition of PCl5(g) to form PCl3(g) and Cl2(g) has Kc = 33.3 at a high temperature. If the initial concentration of PCl5 is 0.1000 M, what are the equilibrium concentrations of the reactants and products?

Because calcium carbonate is a sink for CO32- in a lake, the student in Exercise 12.39 decides to go a step further and examine the equilibrium between carbonate ion and CaCOj. The reaction is Ca2+(aq) + COj2_(aq) ** CaCO,(s) The equilibrium constant for this reaction is 2.1 X 10*. If the initial calcium ion concentration is 0.02 AI and the carbonate concentration is 0.03 AI, what are the equilibrium concentrations of the ions? A student is simulating the carbonic acid—hydrogen carbonate equilibrium in a lake: H2COj(aq) H+(aq) + HCO}‘(aq) K = 4.4 X 10"7 She starts with 0.1000 AI carbonic acid. What are the concentrations of all species at equilibrium?