Kp

Seite 1

Kp

Used for gaseous equilibria

Doesn’t use concentration

Instead uses partial pressures p(A)

Kp = p(NH3)2 / p(N2) x p(H2)3 for the reaction N2 +3H2(g) à 2NH3(g)

P(A) = Mole fraction (A) x total pressure p

1 mole of gas = 24 dm3

Partial pressure is the contribution each gas makes towards the total pressure.

Pa = Pascals

kPa = Kilopascals

atm = Atmospheres

Heterogeneous equilibria

Contains species in different states

Liquids and solids are omitted