Determine the Value of K_c for the Following Reaction If

Multiple Choice

Determine the value of K_c for the following reaction if the equilibrium concentrations are as follows: [PBr₅]_eq = 0.56 M,[PBr₃]_eq = 0.23 M,[Br₂]_eq = 6.6 M. PBr₅(g) ⇌ PBr₃(g) + Br₂(g)

A) 2.7
B) 0.93
C) 0.37
D) 4.2
E) 0.76