One mole of N₂O₄ (g) at 300 K is kept in a closed container under one atm. It is heated to 600 K whe — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

Initial state: 1 mole at 300 K, 1 atm. If heated to 600 K without dissociation, pressure would double to 2 atm. Since 20% dissociates (N₂O₄ ⇌ 2NO₂), degree of dissociation α = 0.2. Total moles at equilibrium = 1 + α = 1.2 moles. Final pressure P = 2 atm × (1.2 / 1.0) = 2.4 atm. Therefore, correct answer is B.