3. For the reaction 2NO(g) + O2(g)<--> 2NO2(g), the equilibrium concentrations at a given temperature are (NO(g)] = 1.0 mol/L, [O2(g)] = 6.0 mol/L, [NO2(g)] = 2.0 mol/L.The value of

K for the system at this temperature is а. 0.33 b. 9.0 c.1.5 d. 0.67 e. 3.0