Question

In a reaction A + B2
Identify the limiting reagent , if any in the following reaction mixtures
1) 300 atoms of A + 200 atoms of B
2) 2 mol A + 3 mol B
3) 100 atoms of A + 100 atoms of B
4) 5 mol A + 2.5 mol B
5) 2.5 mol A + 5 mol B
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Answer 1

Answer:

(i) 200 molecules of B will react with 200 atoms of A and 100 atoms of A will remain unreacted. Hence, B2​ is the limiting reagent.

(ii) 2 moles of A will react with 2 moles of B2​ and 1 mole of B2​ will remain unreacted. Thus, A is the limiting reagent.

(iii) 100 atoms of A will react with 100 molecules of B2​. Thus, both reagents are present in stoichiometric amounts.

(iv) 2.5 mole of B2​ will react with 2.5 mole of A and 2.5 mole of A will remain unreacted. Hence, B2​ is the limiting reagent.

(v) 2.5 moles of A will react with 2.5 moles of B2​ and 2.5 moles of B2​ will remain unreacted. Thus, B2​ is the limiting reagent.