The effect of temperature on the equilibrium constant of a reaction can be determined using the van 't Hoff equation and the concept of exothermic and endothermic reactions.The given reaction is:N2 g + 3H2 g 2NH3 g This reaction is exothermic, meaning it releases heat when it proceeds in the forward direction formation of NH3 . The heat can be considered as a "product" in this case.When the temperature increases, according to Le Chatelier's principle, the equilibrium will shift in the direction that absorbs the added heat. In this case, the equilibrium will shift to the left toward the reactants to absorb the heat.As a result, the concentration of the reactants N2 and H2 will increase, while the concentration of the product NH3 will decrease. This leads to a decrease in the equilibrium constant K for the reaction.In summary, for the given exothermic reaction, an increase in temperature will cause the equilibrium constant K to decrease, shifting the equilibrium towards the reactants.