The equilibrium constant for the reaction w+x⇌ y + z is 9. If one mole of each of w and x are mixed and there is no change in volume, the number of moles of y for formed is

W + X ⇌ Y + Z       K=9 Initia                                     1       1        0      0 At. eq.                                1-x  1-x   x       x K=9=x2(1−x)2 ∴x=0.75  Moles of y=0.75