Phosphorus tribromide decomposes to form phosphorus and bromine, like this: 4pbr3 (g) → p4 (g) + 6br2 (g) write the pressure equilibrium constant expression for this reaction

Chemical reaction: 4PBr₃(g) → P₄(g) + 6Br₂(g).
Pressure equilibrium constant (Kp) express the relationship between product pressures and reactant pressures. The partial pressures of gases are used to calculate pressure equilibrium constant.
Kp = (p(P₄)  · p(Br₂)⁶) ÷ p(PBr₃)⁴. 
p(P₄) - partial pressure of phosphorus.
p(Br₂) - partial pressure of bromine.

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