The Kp is the eqilibrium constant for a gas phase reaction and obtained from the law of mass action.
The term Kp is used to show the equilibrium constant in a gas phase reaction. The questionis incomplete hence I will try to give a few details.
Given a hypothethical reaction; A(g) + B(g) ⇄C(g) then the Kp is obtaiened from; Kp = pC/pA . pB
Lastly, the equilibrium constant can tell the direction in which a reaction is headed. A large equilibrium constant shows that the forward reaction is favored.
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