engineering chemistry MCQ #2155

The value of Kc for the reaction A ⇌ 2B is 4. If the initial concentration of A is 1 M, what is [B] at equilibrium?

engineering chemistry MCQ #2155

  1. Question 1

    Q1. The value of Kc for the reaction A ⇌ 2B is 4. If the initial concentration of A is 1 M, what is [B] at equilibrium?

    • A) 0.8 M
    • B) 1 M
    • C) 0.5 M
    • D) 0.2 M

    Answer: 0.8 M

    Explanation: Kc = [B]²/[A], assuming x M of A reacts, 4 = (2x)²/(1-x), solving gives x = 0.4, hence [B] = 2x = 0.8.