engineering chemistry MCQ #2162

The value of Kc for the reaction 2A ⇌ B + C is 0.5. If the initial concentration of A is 2 M, what is [B] at equilibrium?

engineering chemistry MCQ #2162

  1. Question 1

    Q1. The value of Kc for the reaction 2A ⇌ B + C is 0.5. If the initial concentration of A is 2 M, what is [B] at equilibrium?

    • A) 0.5 M
    • B) 1 M
    • C) 0.25 M
    • D) 0.75 M

    Answer: 0.25 M

    Explanation: Kc = [B][C]/[A]², assuming x M of A reacts, 0.5 = x²/(2-2x)², solving gives x = 0.5, [B] = 0.25.