Ncert Exercises & Solutions

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction $2 A + 4 B \to 3 C + 4 D$ , when 5 moles of A react with 6 moles of B, then

1. which is the limiting reagent?

2. calculate the amount of C formed.

2 A + 4 B \to 3 C + 4 D

According to the given reaction, 2 moles of A react with 4 moles of B.

Hence, 5 moles of A will react with 10 moles of B

(\frac{5 \times 4}{2} = 10 moles)

(a) It indicates that reactant B is limiting reagent as it will consume first in the reaction because we have only 6 moles of B.

(b) Limiting reagent decide the amount of product produced.

According to the reaction,

4 moles of B produces 3 moles of C

∴

6 moles of B will produce

\frac{3 \times 6}{4} = 4.5

moles of C.

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