Please help me to understand to calculate the equilibrium concentrations of reactant and products

Use the References to access important values if needed for this question. The equilibrium constant, Kc, for the following reaction is 83.3 at 500 K. PC13(9) + Cl2(9) 2PCi5(9) Calculate the equilibrium concentrations of reactant and products when 0.492 moles of PCl3 and 0.492 moles of Cl2 are introduced into a 1.00 L vessel at 500 K. [PCI3]= [C12] [PCI5] = Submit Answer Retry Entire Group 9 more group attempts remaining