GKFix MCQ Question

What is the value of Kp for the reaction N₂O₄(g) ⇌ 2NO₂(g) when N₂O₄ is 50% dissociated at 1 atm?

• A. 0.67 atm
• B. 1.00 atm
• C. 1.33 atm
• D. 2.00 atm