MCAT General Chemistry Question 223: Answer and Explanation

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Question: 223

1. Which of the following manipulations is capable of changing the Keq of the reaction shown below?

N2 (g) + H2(g) 2 NH3(g)

  • A. Doubling the concentrations of N2 (g), H2(g), and NH3(g)
  • B. Tripling the volume of the reaction container
  • C. Increasing the pressure from 1 to 2 atm
  • D. Decreasing the temperature to from 298 K to 273 K

Correct Answer: D

Explanation:

D Equilibrium constants are specific to a single temperature and standard state free energy change according to: ∆G° = -RTlnK. Altering temperature is the only answer choice that can change the reaction's Keq.

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