question_answer 31)

In a reaction, \[A+{{B}_{2}}\to A{{B}_{2}}\] Identify the limiting reagent, if any, in the following reaction mixtures (i) 300 atoms of A + 200 molecules of \[{{B}_{2}}\] (ii) \[\text{2 mol A + 3 mol }{{\text{B}}_{\text{2}}}\] (iii) \[100\,\,atoms\,of\,A+100\,molecules\,of\,{{B}_{2}}\] (iv) \[5molA+2.5mol{{B}_{2}}\] (v) \[2.5molA+5mol{{B}_{2}}\]  

Answer:

(i) \[{{B}_{2}}\] will be limiting reagent because it gives least amount of product on being completely consumed. (ii) A will be limiting because it gives least amount of product on complete consumption. (iii) None of the reactant is limiting because both will be completely consumed in the reaction. (iv) \[{{B}_{2}}\] will be limiting. (v) A will be limiting.