\( 2\, \mathrm{NOCl}\,(g) \rightleftharpoons 2\mathrm{NO}\,(g) + \mathrm{Cl_2}\,(g) \)
In an experiment, \( 2.0 \) moles of \( \mathrm{NOCl} \) was placed in a one-litre flask and the concentration of \( \mathrm{NO} \) after equilibrium established, was found to be \( 0.4 \; \mathrm{mol/L} \). The equilibrium constant at \( 30^\circ \mathrm{C} \) is ________ \( \times 10^{-4} \).
