PCIs decomposes according to the reaction: PCl; (g) - PCl₃ (g) + Cl₂ (g). If 8.0 mol PCIs were placed in a 4.0 L vessel and allowed to come to equiLiBrium at 300 K, leaving 2.0 mol PCIs in the mixture, What is the equiLiBrium constant (K)? Round your answer to one place past the decimal.