Question

The reaction system POBr3(g) =POBr(g) + Brz(g) is at equilibrium. Which of the following statements describes the behavior of the system if POBr is added to the container?
A.POBr will be consumed in order to establish a new equilibrium.
B. the partial pressures of POBrand POBr will remain steady while the partial pressure of bromine increases.
C. the partial pressure of bromine will increase while the partial pressure of POBr decreases.
D. the partial pressure ofbromine remains steady while the partial pressures of POBrand POBr increase.
E, the forward reaction will proceed to establish equilibrium.

Answer 1

Answer:

A. POBr will be consumed in order to establish a new equilibrium.

Explanation:

POBr3(g) =POBr(g) + Brz(g)

The question is based on Le Chatelier's principle. This principle states that whenever a system at equilibrium is stressed, the system would undergo changes to annul that stress.

If more POBr  is added to the system, it means that the concentration of the products have been increased and as a result the equilibrium has been disturbed. To restore equilibrium, the system would have to shift in a direction that reduces the product concentration.

This direction is the backward direction and in doing so, POBr will be consumed.

The correct option is option A.

Answer 2

The statement that describes the behavior of the system is:

A. POBr will be consumed in order to establish a new equilibrium.

Reaction system:

POBr₃(g)  ⇄ POBr(g) + Br₂(g)

According to Le Ch-atelier principle,  if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to re-establish an equilibrium.

If more POBr is added to the system, it means that the concentration of the products have been increased and as a result the equilibrium has been disturbed. To restore equilibrium, the system would have to shift in a direction that reduces the product concentration.

This direction is the backward direction and in doing so, POBr will be consumed.

Thus, the correct option is option A.

Find more information about Equilibrium here:

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