At a particular temperature 8.0 mol NO2 gas is placed in a 1.0-L container. Over time the NO2 decomposes to NO and O2: 2NO2(g) 2NO(g) O2(g) At equilibrium the concentration of NO(g) was found to be 2.0 mol/L. Calculate the value of K for this reaction (using units of mol/L for the concentrations).