The reversible reactionP4(g)+6Cl2(g)⇌4PCl3(g)is carried by mixing equal moles of phosphorus and chlorine  in an evacuated vessel. Then at equilibrium ____which condition is always right

P4(g)+6Cl2(g)⇌4PCl3(g) Initial C mol C mol   Ateqm. C(1-α)C(1-6α)4Cα Clearly, P4>Cl2 at equilibrium ( according to stoichiometric equation, limiting reagent is chlorine, therefore it's concentration is less than phosphorous