engineering chemistry MCQ #2159

The equilibrium constant Kc for the reaction H2 + I2 ⇌ 2HI is 50. If the initial concentrations of H2 and I2 are 1 M each, what is [HI] at equilibrium?

engineering chemistry MCQ #2159

  1. Question 1

    Q1. The equilibrium constant Kc for the reaction H2 + I2 ⇌ 2HI is 50. If the initial concentrations of H2 and I2 are 1 M each, what is [HI] at equilibrium?

    • A) 1.56 M
    • B) 1 M
    • C) 0.5 M
    • D) 1.8 M

    Answer: 1.56 M

    Explanation: Using Kc = [HI]²/[H2][I2] and assuming x M react, 50 = (2x)²/(1-x)², solving gives x = 0.78, [HI] = 1.56.