At a certain temperature the equilibrium constant for the subsequent chemical equation is 2.80. At this temperature, compute the number of moles of NO2(g) that must be added to 2.52 mol of SO2(g) in order to form 1.20 mol of SO3(g) at equilibrium.
SO2 (g) + NO2 (g) ---> SO3 (g) + NO (g)