Part I
A) The solubility of silver bromide can be increased by dissolvingit in a solution containing the thiosulfate anion.
AgBr(s) Ag⁺ (aq) + Br^-(aq)    K₁ = 7.7 x 10^-13
Ag⁺(aq) + 2S₂O₃^2- (aq)Ag(S₂O₃)₂^3-(aq)     K₂ = 4.7 x10¹³
What is the value of the equilibrium constant for the overallreaction?
AgBr(s) + 2S₂O₃^2-(aq)Ag(S₂O₃)₂^3-(aq) +Br^-(aq)
   a) 12.4x10¹³
b) 3.6x10^-9
   c) 4.7x10^-9
  d)4.7x10^13
   e) 36
B) Consider the following reactionat equilibrium. Which change will shift the equilibirum to theleft?

   C3H8(g) + 5 O2(g)  ⇌ 3 CO2(g) + 4H2O(l)          ΔH°= -2220 kJ
   a) decreasing temperature
b) increasing temperature
     c) increasing volume
d) increasing the concentration ofoxygen gas
C) Consider the following reaction at equilibrium.Which change will shift the equilibrium to theleft?

   CO2(g) + 2 H2O(l) ⇌ CH4(g) + 2O2(g)       ΔH° = +890 kJ
   a) decreasing temperature
   b) decreasing volume
   c) increasing amount of methane gas
   d) All of the above
   e) none of the above

Part II
A) Consider the following reactionat equilibrium. What effect will increasing the pressure of thereaction mixture have on the system?

   2 H2S(g) + 3 O2(g)  ⇌ 2 H2O(g) +2 SO2(g)
a) The reaction willshift to the right in the direction of the products
   b) No effect will be observed
   c) The reaction will shift to the left in thedirection of the reactants
   d) The equilibrium constant will decrease
   e) The equilibrium constant will increase