# Consider the reaction N_2(g) + 3H_2(g) rightleftharpoons 2NH_3(g). What is the effect of decreasing the volume on the combined gas?

$\text{Le Chatelier's principle}$ would predict that this drive the equilibrium to the right hand side.
In this scenario, $\text{Le Chatelier's principle}$ would predict that the equilibrium would be driven to the side of the reaction that exerts least pressure, i.e. the product side. Note that when we describe how the equilibrium changes, we would say that we are increasing the concentration of dinitrogen and dihydrogen by increasing their partial pressures.