Answer Happy

Can anyone explain this to me and show me a step by step
solution
3) -/1 points Consider the two reactions below and determine the correct expression for the reaction of formation of one mole of dinitrogen tetraoxide from its elemental constituents in the gas phase Kf. 0.() (1)NO2(g) =02(9)+52(9) K1 (2)N204(9) = 2N02(9) K2 Kf,N204(9) = a - enter K1 or K2 b-enter K1 or K2 Enter a numerical value for Enter a numerical value for y Evaluate