Limiting Reactants (click the title)

Usually, one reactant is used up before the other> this reactant is called the LIMITING REAGANT in other words, it stops or limits the reaction. The limiting reagant determines the amount of product produced. Assume one reactant is the limiting reactant and determine what quantity of the other is needed.



EXAMPLES:

1. What is the limiting reactant when 125g of P4 reacts with 325 g of Cl2 forming phosphorus trichloride?
   P4+6Cl2=4PCl3 (125g=p4/ 323g=6Cl2)
   
   125 g X1 mol/71 gX 4 mol/ 6 mol x 137.4g/ 1mol= 417 g PCl3
   

-- Michelle Haughian