MDCAT Chemistry MCQ #2226

In the synthesis of ammonia (N2 + 3H2 ⇌ 2NH3), the relationship between Kp and Kc differs from the H2 + I2 ⇌ 2HI reaction because:

MDCAT Chemistry MCQ #2226

  1. Question 1

    Q1. In the synthesis of ammonia (N2 + 3H2 ⇌ 2NH3), the relationship between Kp and Kc differs from the H2 + I2 ⇌ 2HI reaction because:

    • A) Kp is always numerically equal to Kc
    • B) Kc depends on pressure while Kp does not
    • C) Kp equals Kc only if the change in gaseous moles is zero
    • D) Kp is used for liquids while Kc is for gases

    Answer: Kp equals Kc only if the change in gaseous moles is zero

    Explanation: Kp equals Kc only when the number of moles of gaseous reactants and products are equal; otherwise, units differ significantly.