MDCAT Chemistry MCQ #2212

For the reaction A + B ℑ C + D, Kc is 10. If a mixture contains [A]=1, [B]=1, [C]=2, [D]=2, what is the predicted direction?

MDCAT Chemistry MCQ #2212

  1. Question 1

    Q1. For the reaction A + B ℑ C + D, Kc is 10. If a mixture contains [A]=1, [B]=1, [C]=2, [D]=2, what is the predicted direction?

    • A) The system is already at equilibrium
    • B) The reaction proceeds in the reverse direction
    • C) The reaction proceeds in the forward direction
    • D) The reaction will stop completely

    Answer: The reaction proceeds in the forward direction

    Explanation: Qc = [C][D] / ([A][B]) = (2*2)/(1*1) = 4. Since Qc (4) < Kc (10), the reaction proceeds forward. Option A is incorrect because Qc ≠ Kc.