** copy and paste error, Could someone walk me through this please! For the decomposition of phosphorous pentachloride to phosphorous trichloride and chlorine at 400K the KC is 1.1x10-2. Given that

1.0g of phosphorous pentachloride is added to a 250mL reaction flask, find the percent decomposition after the system has reached equilibrium.....the equation given is PCl5(g) <-->PCl3(g)+Cl2(g) Kc=1.1x10^2