Consider this reaction:

PCl5(g) + heat PCl3 (g) + Cl2 (g)

What will happen when the pressure is decreased?
There will not be a shift in equilibrium.
There will be a shift toward the products.
There will be a shift toward the reactants.
There is not enough information to make a prediction.

Question

Consider this reaction:

PCl5(g) + heat  PCl3 (g) + Cl2 (g)

What will happen when the pressure is decreased?
There will not be a shift in equilibrium.
There will be a shift toward the products.
There will be a shift toward the reactants.
There is not enough information to make a prediction.

unklerhaukus · Answer

Le Châtelier's principle, states that a decrease in pressure will favour the side of the chemical reaction equation, that has the most moles of gas.