MDCAT Chemistry MCQ #2208

In a 1.0 dm³ flask, the equilibrium mixture for N2O4 ℑ 2NO2 contains 0.1 moles of N2O4 and 0.4 moles of NO2. Calculate the Kc value.

MDCAT Chemistry MCQ #2208

  1. Question 1

    Q1. In a 1.0 dm³ flask, the equilibrium mixture for N2O4 ℑ 2NO2 contains 0.1 moles of N2O4 and 0.4 moles of NO2. Calculate the Kc value.

    • A) 1.6 mol dm⁻³
    • B) 0.4 mol dm⁻³
    • C) 4.0 mol dm⁻³
    • D) 0.16 mol dm⁻³

    Answer: 1.6 mol dm⁻³

    Explanation: In 1 dm³, moles equal molarity. Kc = [NO2]^2 / [N2O4] = (0.4)^2 / 0.1 = 1.6. Option B fails by not squaring the product concentration.