alleryFor the reaction aA + bB ⇌ cC + dD, the equilibrium constant K_c is defined as:
A[C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ
B[A]ᵃ[B]ᵇ / [C]ᶜ[D]ᵈ
C[A][B] / [C][D]
D[C][D] / [A][B]
Answer & Solution
Correct answer: A. [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ
1. Law of mass action at equilibrium: products / reactants, each raised to its stoichiometric coefficient.
2. K_c = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ.
3. Forward / reverse forms differ by 1/K — pick the convention consistently.
_Source: syllabus Chem Ch 7 §7.4 Law of Chemical Equilibrium_
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