Effect of heat conversion: The reaction of PCl5 dissociation is endothermic. By increasing the temperature, the equilibrium is displaced to the side where the heat is absorbed. Therefore, increasing the temperature increases the dissolution of PCl5.
Effect of pressure change: On increasing the pressure, the equilibrium is displaced towards which there is a decrease in pressure ie there is a decrease in the number of molecules(P ∞ n). In the above equilibrium there is a decrease in the number of molecules in the direction of the opposite reaction. Therefore, by increasing the pressure, the above equilibrium will be displaced in the direction of the opposite reaction, that is, the amount of dissociation of PCl5 will be reduced.