In a reaction A+B_(2) rarr AB_(2) Identify the limiting reagent, if any, in the following reaction mixtures. a. 300 "atoms" of A+ 200 molecules of B b. 2 mol A+3 mol B c. 100 "atoms" of A+100 molecules of B d. 5 mol A+2.5 mol B e. 2.5 mol A + 5 mol B

In a reaction A+B_(2) rarr AB_(2) Identify the limiting reagent, if

1.	In a reaction A+B_(2) rarr AB_(2) Identify the limiting reagent, if any, in the following reaction mixtures. a. 300 "atoms" of A+ 200 molecules of B b. 2 mol A+3 mol B c. 100 "atoms" of A+100 molecules of B d. 5 mol A+2.5 mol B e. 2.5 mol A + 5 mol B
Answer» Solution :(i) According to the GIVEN reaction `A + B_(2) to AB_(2)`, one atom of A reacts with one molecule of B. 300 atoms of A will require 300 molecules of B for COMPLETE reaction. Since, the molecules of B present are only 200, it is short of 100 molecules. Thus, A is in excess. Therefore, B is the limiting reagent. (ii) 1 mol of 4 reacts with 1 mol of B. `therefore` 2 mol of A will react with 2 mol of B. Since, 3 mol of B are present, it is in excess. Thus, A is the limiting reagent. (iii) 100 atoms of A will completely react with 100 molecules of B. Thus, both will get consumed . HENCE, there is no limiting reagent in this CASE. (IV) 2.5 mol of B will react with 2.5 mol of A. Thus, A will be left in excess. Therefore, B is the limiting reagent. (v) 2.5 mol of A will react with 2.5 mol of B. Thus, B will be left in excess. Therefore, A is the limiting reagent.