At 500 C, K p = 4.9*10^{- 5} for the exothermic reaction:
N₂(g) + 3 H₂ (g) 2 NH₃(g) The value of K p at 1000 C is:

Question

At 500 C, K p = 4.9*10^{- 5} for the exothermic reaction: N₂(g) + 3 H₂ (g) 2 NH₃(g) The value of K p at 1000 C is:

Quizplus · Accepted Answer

The given reaction is exothermic, meaning it releases heat. Le Chatelier's principle states that when a stress is applied to a system at equilibrium, the system will shift in order to counteract the stress. In this case, increasing the temperature from 500 C to 1000 C is a stress that will cause the system to shift in the endothermic direction in order to absorb some of the added heat. This means that the concentration of the reactants will increase and the concentration of the products will decrease, causing Kp to decrease. Therefore, Kp at 1000 C will be less than 4.9×10^-5. Choice B is the best answer.

At 500 C, K P = 4