For the reaction below, an analysis of an equilibrium mixture is performed at a certain temperature.

N₂(g) + 3 Cl₂(g) 2 NCl₃(g)

It is found that [NCl₃(g)] = 1.9 10^-1 M, [N₂(g)] = 1.4 10^-3 M, and [Cl₂(g)] = 4.3 10^-4 M. Calculate K for the reaction at this temperature.