1.0 mol of PCl₅ is heated in a 1.0 dm³ vessel and is 20% dissociated at equilibrium (PCl₅ ⇌ PCl₃ + Cl₂). What is Kc?
Correct answer A. 0.05 mol dm⁻³
Explanation
At equilibrium [PCl₅] = 0.80 and [PCl₃] = [Cl₂] = 0.20 mol dm⁻³, so Kc = (0.20 × 0.20) ÷ 0.80 = 0.05 mol dm⁻³.
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