Given the chemical reaction (R1) below, calculate the numerical value of the equilibrium constant for reaction R2 (give your answer to three sig figs)
(R1) 2 NO(g) + O₂(g) ⇋ 2 NO₂(g); Kc = 3.88
(R2) 6 NO(g) + 3 O₂(g) ⇋ 6 NO₂(g)