For the reaction:<br>2NOBr(g) ⇌ 2NO(g) + Br₂(g),<br>the ratio K_p/P, where P is the total pressure o — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

P_Br₂ = P/9. Let P_NOBr = p₁ and P_NO = p₂. From stoichiometry, P_NO = 2 P_Br₂ = 2P/9. Total P = p₁ + p₂ + P_Br₂ = p₁ + 2P/9 + P/9 = p₁ + P/3 = P. Thus p₁ (P_NOBr) = 2P/3. K_p = P_NO² P_Br₂ / P_NOBr² = (2P/9)²(P/9) / (2P/3)². K_p = (4P³/729) / (4P²/9) = (P/729) × 9 = P / 81. Thus, K_p / P = 1 / 81. Therefore, correct answer is B.