The reaction of chlorine gas with solid phosphorus (#P_4#) produces solid phosphorus pentachloride. When 160 of chlorine reacts with 23.0 g of #P_4#, which reactant is limiting? Which reactant is in excess?
We need a balanced chemical equation, before we determine the reagent in excess. I think it is chlorine gas.
This is of course a redox reaction, and establishes the stoichiometry. One equiv of phosphorus is oxidized by
Clearly, phosphorus is in deficiency, and 100% yield would give rise to