I’m so lost on this question! I’m dealing with Le Chatelier’s principle The following reaction has achieved equilibrium.

I’m so lost on this question! I’m dealing with Le Chatelier’s principle

The following reaction has achieved equilibrium. Predict the effect on the formation of phosphorus pentachloride (increase, decrease, or no effect) for the stated changes to the system:

PCl5(g) <–> PCl3(g) + Cl2(g)

a) the concentration of the phosphorous trichloride is increase

b) the concentration of chlorine is increase

c) The volume of the container in which the reaction is taking place is suddenly made smaller

d) the pressure of the system is increased by adding one atmosphere of gaseous nitrogen to the container