Kp expression
Kp expression
Formula
Kp = (P_C^c × P_D^d) / (P_A^a × P_B^b)
Real World
In the contact process used by BASF to manufacture sulfuric acid, chemists use the Kp expression for 2SO₂ + O₂ ⇌ 2SO₃ to determine optimal operating pressures that maximise SO₃ yield.
Exam Focus
Always derive units from Δn; Kp is unitless only when Δn = 0 — examiners penalise missing or wrong units.
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