MCAT General Chemistry Question 80: Answer and Explanation

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Question: 80

5. If Kc ? 1:

  • A. the equilibrium mixture will favor products over reactants.
  • B. the equilibrium mixture will favor reactants over products.
  • C. the equilibrium concentrations of reactants and products are equal.
  • D. the reaction is essentially irreversible.

Correct Answer: A

Explanation:

The larger the value of Keq (whether Kc or Kp), the larger the ratio of products to reactants. Therefore, if Kc - 1, there are significantly larger concentrations of products than reactants at equilibrium. Even with a large Keq, the reaction will ultimately reach equilibrium far toward the products side and is therefore reversible, eliminating choice (D).

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