Question

You are performing the below chemical reaction using Reagent A and Reagent B to produce Product C: A + B -> C You are using 2 moles of A and 5 moles of B. How many Equivalents of B are you using?

Answer 1

Answer: The equivalents of B that are getting used in the given chemical reaction are 2 moles.

Explanation:

Excess reagent is defined as the reagent which is present in large amount in the chemical reaction.

Limiting reagent is defined as the reagent which is present in less amount and also it limits the formation of products.

We are given:

Amount of A = 2 moles

Amount of B = 5 moles

For the given chemical reaction:

$A+B\rightarrow C$

By Stoichiometry of the reaction:

1 mole of A reacts with 1 mole of B

So, 2 moles of A will react with = $\frac{1}{1}\times 2=2mol$ of B

As, given amount of B is more than the required amount. So, it is considered as an excess reagent.

Thus, A is considered as a limiting reagent because it limits the formation of product.

Amount of B unused = (5 - 2) = 3 moles

Amount of B used = 2 moles

Hence, the equivalents of B that are getting used in the given chemical reaction are 2 moles.