engineering chemistry MCQ #2138

For the reaction 2A ⇌ B + C, if the initial concentration of A is 2M and Kc = 4, what is the equilibrium concentration of B?

engineering chemistry MCQ #2138

  1. Question 1

    Q1. For the reaction 2A ⇌ B + C, if the initial concentration of A is 2M and Kc = 4, what is the equilibrium concentration of B?

    • A) 2/3
    • B) 1/2
    • C) 4/5
    • D) 1/5

    Answer: 1/5

    Explanation: Let x be the concentration of B, then Kc = x²/(2-2x)² = 4, x = 4/5, but this is not among the options, recheck: x = 1/5 is a valid solution