Question

Consider the following equilibrium for which H = 16.48:

2 NOBr(g) Y--> 2 NO(g) + Br2(g)

How will each of the following changes affect an equilibrium mixture of the 3 gases in this reaction?

(a) NO is added to the system.

(b) The reaction mixture is heated.

(c) The volume of the reaction vessel is doubled.

(d) A catalyst is added to the reaction mixture.

(e) The total pressure of the system is increased by adding a noble gas.

(f) Br2(g) is removed from the system.

Answer 1

Sol :- Consider the following equilibrium for which

2 NOBr(g) Y--> 2 NO(g) + Br2(g) , delta H = 16.48(Endothermic reaction)

(a). NO is added to the system,then equilibrium will shifts towards reactant side because according to Le-Chatelier's principle as the concentration of any one of the product species increases then equilibrium will shift in reactant side that is backward direction.

(b). The reaction mixture is heated, then equilibrium will shift towards products side, because according to Le-Chatelier's principle for endothermic reaction with increase in temperature equilibrium will shift towards products side.

(c). The volume of the reaction vessel is doubled that is pressure reduces to half therefore equilibrium will shift towards products side because according to Le-Chatelier's principle as the pressure of the container reduces then equilibrium will shift in that side where number of moles of gases are more.

(d). A catalyst is added to the reaction mixture, no change in equilibrium stage because catalyst will increase the rate of forward as well as backward reaction simultaneously.

(e). The total pressure of the system is increased by adding a noble gas, then equilibrium will shift towards reactant side because according to Le-Chatelier's principle as the pressure of the container increases then equilibrium will shift in that side where number of moles of gases are less.

(f). Br₂(g) is removed from the system, then equilibrium will shifts towards products side because according to Le-Chatelier's principle as the concentration of any one of the product species decreased then equilibrium will shift towards products side.