α = 0.5
Initially = 1 mole
At equilibrium
N₂O₃ = 0.5
NO = 0.5
NO₂ = 0.5
Total moles = 1.5
Partial pressures
PN₂O₃ = P/3
PNO = P/3
PNO₂ = P/3
Kp = (PNO)(PNO₂)/PN₂O₃
Kp = (P/3)(P/3)/(P/3)
Kp = P/3
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