In the Haber process, one mole of nitrogen gas reacts with three moles of hydrogen gas to produce two moles of ammonia. The process is exothermic. If a particular Haber synthesis is at equilibrium [ee-kwuh-LIB-ree-uhm], which of the following changes to the reaction's conditions are predicted by Le Chatelier's principle to INCREASE the yield of ammonia?

W) Adding a catalyst

X) Increasing the temperature

Y) Increasing the pressure of the reaction mixture

Z) Increasing the volume of the reaction vessel
Y) INCREASING THE PRESSURE OF THE REACTION MIXTURE