In a reaction `A +B_(2) rarr AB_(2)` identify the limiting reagent, if any, in the following reaction mixture.
(i) 300 atoms of `A + 200` molecules of B
(ii) 2 mol A `+` 3 mol B
(iii) 100 atoms of A `+` 100 molecules of B
(iv) 5 mol A `+` 2.5 mol A
(v) 2.5 mol A `+` 5 mol B

Explanation

Reaction `A + B_(2) rarr AB_(2)`
(i) Accroding to above reaction, one atom of A react with one molecules of B. So, 200 atoms of a react with 200 molecules of B. So, B is a limiting reagent and A is excess reagent is remain.
(ii) According of above, one mole of A react with one mole of B. So, 2 mol of A react with 2 mole of B. So, A is limiting reagent.
(iii) No lomiting reagent.
(iv) 2.5 mol of B is consumed to react with 2.5 mol of A atom. So, B is limiting reagent.
(v) 2.5 mol of A is consumed to react with 2.5 mol of B atom. So, A is limiting reagent.