Answer
$$K_p = 6.2 \times 10^5$$
Work Step by Step
$$K_p = K_c (RT)^{\Delta n}$$
$\Delta n = n(products) - n(reactants) = (2) - (3 + 1) = -2$
$R = 0.08206 $
$T = 298$
$K_c = 3.7 \times 10^{8}$
$$K_p = K_c (RT)^{\Delta n} = (3.7 \times 10^{8})(0.08206 \times 298)^{-2} = 6.2 \times 10^5$$
