Question

For the reaction PCl5(g) + heat PCl3(g) + Cl2(g), what will happen when the pressure is increased?

Answer 1

This can be solved using the Le Chatelier's principle, which is widely used in order to predict the effect of the change of conditions on chemical equilibriums. According to Le Chatelier's principle if a chemical system at equilibrium undergoes a change in concentration, temperature, volume, or pressure, the equilibrium shifts in such a way so as to undo the effect of the change.

PCl5 (g) + heat↔ PCl3 (g)+ Cl2 (g)

Answer 2

Reaction: PCl₅ + Heat ↔ PCl₃ + Cl₂

Here, The reaction is in equilibrium, so when you increase the pressure, system will try to decrease it, Since the forward reaction results in the increase of gaseous pressure, so the equilibrium will shift towards the "LEFT"

Hope this helps!