An evacuated reaction vessel is filled with 0.80 atm of N₂ and 1.68 atm of Br₂. When equilibrium is established according to the reaction below, there are 1.42 atm of Br₂ remaining in the vessel. What is Kp for this reaction?
2 NBr₃ (g) ⇌ N₂ (g) + 3 Br₂ (g)
