Three moles of PCl , three moles of PCl and two moles of Cl are taken in a closed vessel. If at equilibrium the vessel has 1.5 moles of PCl , the number of moles of PCl present in it is (KCET 2008)

Initial moles 5(g) 3(g) 2 PCl PCl Cl (g) 3 3 2 Equilibrium moles 3 3 2 Given 3 = 1.5 Hence, 3 1.5 1.5 Therefore, number of moles of equilibrium of 3 PCl 3 3 1.5 4.5