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Question

In a reaction A+B2AB2 idetify the limiting reagent if any:
(a) 2 atoms of A reacts with 2 molecules of B.
(b) 2 moles of A reacts with 3 moles of B.

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Solution

  • According to the given reaction, 1 atom of A combines with 1 molecule of B. Thus, all 2 atoms of A will combine with all 2 molecules of B. Hence, the mixture is stoichiometric where no limiting reagent is present.
  • According to the reaction, 1 mole of A reacts with 1 mole of B. Thus, 2 moles of A will react with only 2 moles of B. As a result, 1 mole of B will not be consumed. Hence, A is the limiting reagent.

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