The dissociation equilibrium of a gas can be represented as :
The degree of dissociation is and is small compared to 1. The expression relating the degree of dissociation <img width=20 height=20 src="https://mytat.co/uploads/question/EQUILIBRIUM-1_filesimage834.png"> with equilibrium constant and total pressure is :
In the reactions, , if 2 moles of , 3.0 moles of and 2.0 moles of are placed in a 2 L flask and the equilibrium concentration of is 0.5 mol/L, the equilibrium constant for the reactions is