40. Solving a chemistry problem

116. The equilibrium of the system 2SO2(g) O2(g)  2SO3(g) was established at the following concentrations (mol/l): [SO2] = 0.6; [O2] = 0.9; [SO3] = 1.5. Calculate the equilibrium constant and the initial concentrations of SO2 and O2. By the value of the constant, indicate which substances predominate in the equilibrium system: initial or reaction products? In what direction will the equilibrium shift: a) with an increase in pressure; b) with an increase in oxygen concentration? Justify your answer based on Le Chatelier´s principle.