Question

Derive mathematically value of K_P for \[\ce{A_{ (g)} + B_{ (g)} ⇌ C_{ (g)} + D_{ (g)}}\].

Answer 1

When the concentrations of reactants and products in gaseous reactions are expressed in terms of their partial pressure, then the equilibrium constant is represented as K_P.

∴ For the reaction,

\[\ce{A_{ (g)} + B_{ (g)} ⇌ C_{ (g)} + D_{ (g)}}\]

the equilibrium constant (K_P) can be expressed using partial pressure as: K_P = `("P"_"C" xx "P"_"D")/("P"_"A" xx "P"_"B")`

Where P_A, P_B, P_C and P_D are equilibrium partial pressures of A, B, C and D respectively.