MDCAT Chemistry MCQ #2219

In the equilibrium X ℑ CO2 + OH-, 0.44g of CO2 and 0.01 moles of OH- are present in 1 dm³. Calculate Kc (Molar mass of CO2 = 44).

MDCAT Chemistry MCQ #2219

  1. Question 1

    Q1. In the equilibrium X ℑ CO2 + OH-, 0.44g of CO2 and 0.01 moles of OH- are present in 1 dm³. Calculate Kc (Molar mass of CO2 = 44).

    • A) 0.44
    • B) 1.0 × 10⁻⁴
    • C) 1.0 × 10⁻⁲
    • D) 4.4 × 10⁻⁳

    Answer: 1.0 × 10⁻⁴

    Explanation: Molality of CO2 = 0.44g / 44g/mol = 0.01 mol. In 1 dm³, [CO2] = 0.01 M. [OH-] = 0.01 M. Kc = [CO2][OH-] = 10⁻⁴. Option A misses the molar mass conversion.