MCAT General Chemistry Question 225: Answer and Explanation

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Question: 225

3. Given the following equilibrium:

N₂(g) + 3 H₂(g) 2 NH₃(g) ∆H = -91.8kJ

How would an increase in temperature affect the concentration of N₂ at equilibrium?

A. The concentration of N₂ will increase because of an increase in K_eq.
B. The concentration of N₂ will decrease because of an increase in K_eq.
C. The concentration of N₂ will increase because of a decrease in K_eq.
D. The concentration of N₂ will remain unchanged.

Correct Answer: C

Explanation:

C Since the reaction is exothermic, an increase in temperature will shift the equilibrium to the left, and the concentration of N₂ will increase, eliminating choices B and D. For exothermic reactions, an increase in temperature will decrease the K_eq, eliminating choice A and making choice C the correct answer.

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