Question

At equilibrium 12(g) + Br2(g) + 2 IBr(g), K = 1.2 x 102 The following concentrations were determined at a particular time: 12(g) = 0.310 mol/L, Br2(g) = 0.310 mol/L and IBr(g) = 2.00 mol/L Calculate Q, the reaction quotient, and by comparing to the K value state if the system is at equilibrium or which direction it will shift if it is not at equilibrium. [3]

Answer 1

9 > Solution At any stage of the reaction other than the chemical equilibrium concentration ratio is given by the expression for the Law of chemical equilibrium and is termed as reaction quotient (Qc) or Q (1) ff. If. Q =k the reaction is in equilibrium (ii) ff qck will tend to increase. As a result, the Beaction will proceed in forward direction . cui' Gwill tend to decrease so as to become equal to k. As a result, the reaction will move in the backward direction. Considen the given reaction as ; Iz (g) + Bra (g) = 2 JBr Cg) K = 1.2x10? [I BOJ (2.00) (0.310)*(0.310) 4 0.096) Q = 4.2 X101 2 [I₂] ² [Brz Here, If Q <K > System is not in equilibrium Q ck o will tend to increase and the reaction will proceed in the forward direction.