At \( 600 \, \text{K} \), \( 2 \, \text{mol} \) of \( \text{NO} \) are mixed with \( 1 \, \text{mol} \) of \( \text{O}_2 \). The reaction occurring as above comes to equilibrium under a total pressure of \( 1 \, \text{atm} \). Analysis of the system shows that \( 0.6 \, \text{mol} \) of oxygen are present at equilibrium. The equilibrium constant for the reaction is __________. (Nearest integer)
