MDCAT Chemistry MCQ #2206

During the thermal decomposition of PCl5 into PCl3 and Cl2 in a closed vessel, what is the mathematical relationship between Kp and Kc?

MDCAT Chemistry MCQ #2206

  1. Question 1

    Q1. During the thermal decomposition of PCl5 into PCl3 and Cl2 in a closed vessel, what is the mathematical relationship between Kp and Kc?

    • A) Kp = Kc
    • B) Kp = Kc(RT)
    • C) Kp = Kc(RT)²
    • D) Kp = Kc(RT)⁻¹

    Answer: Kp = Kc(RT)

    Explanation: Kp = Kc(RT)^Δn; here Δn = 2 - 1 = 1, so Kp = Kc(RT). Option A assumes Δn is zero, which only happens when moles are equal.