11. Equilibrium 2 (Kp)
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Give the Kp equation for: 2A(g) + B(g) ↔ C(g)
Kp = pC / p(A)2 x pB Kp = partial pressure of C / partial pressure of C x partial pressure of (A)2
What are the possible different units for Kp
Nm-2 Pa Atmospheres (atm) . Units for the equilibrium constant Kp can be worked out exactly as for Kc
What is the only factor that affects Kp
Temperature If forward reaction is exothermic: Increasing temperature shifts equilibrium left (torwards reactants) so Kp decreases (same goes for Kc) If forward direction is endothermic: Increasing temperature shifts equilibrium right (towards products). Kc and Kp values increase.
Describe how to work out Kp from the total pressure snd number of moles of the reactants and products at equilibrium
I - initial moles C - change in moles E - moles at equilibrium Mole fraction - divide moles at equilibrium by the total number of moles at equilibrium Partial pressure - mole fraction x total pressure