\[COC{{l}_{2}}\] gas dissociates according to the equation, \[COC{{l}_{2}}(g)\,\,\,\,CO(g)+C{{l}_{2}}(g).\] When heated to 700 K the density of the gas mixture at 1.16 atm and at equilibrium is 1.16 g/litre. The degree of dissociation of \[C{{O}_{2}}\] at 700 K is -