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Heat of Formation

In a reaction...

Question

In a reaction, A + 2B2 --> AB2. Identify the limiting reagent, if any, in the following reaction mixtures. (i) 300 atoms of A + 200 molecules of B (ii) 2 mol A + 3 mol B ?

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Solution

Given reaction,
A + B₂ → AB₂
A limiting reagent determines the extent of a reaction. Its is the reactant which is the first to get consumed during a reaction, thereby causing the reaction to stop and limiting the amount of products formed.
(i) According to the given reaction, 1 atom of A will react with 1 molecule of B. Thus 200 molecules of B will react with 200 atoms of A, thereby leaving 100 atoms of A unused. Hence, B is the limiting reagent
(ii) According to the given 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 moles of B will not be consumed. Hence, A is the limiting reagent.

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Similar questions

In a reaction

A + B₂ → AB₂

Identify the limiting reagent, if any, in the following reaction mixtures.

(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 B

(v) 2.5 mol A + 5 mol B

A + B_{2} \to {A B}_{2}

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In a reaction A+B₂ ----------> AB₂

Identify the limmiting reagent if any in the following reaction mixtures.

1) 300 atoms of A+ 200 molecules of B

2) 2mol A+ 100 mol B

3) 100 atoms of A+ 100 molecules of B

4) 5 Mol of A+ 2.5 mol B

5) 2.5 mol A + 5 mol of B

A + B_{2} \to {A B}_{2}

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