Question

In a reaction container, 100g of hydrogen and 100g of $C{l_2}$ are mixed for the formation of $HCl$gas. What is the limiting reagent and how much$HCl$ is formed in the reaction?
A. ${H_2}$is limiting reagent and 36.5g of HCl are formed
B. $C{l_2}$is limiting reagent and 104.26 g of HCl are formed
C. ${H_2}$is limiting reagent and 142 g of HCl are formed
D. $C{l_2}$is limiting reagent and 73 g of HCl are formed.

Answer 1

We have to remember that the mass of hydrochloric acid is to find from the given information. We can calculate the total mass of hydrochloric acid using the number of moles of hydrogen and chlorine. We have to remember that the limiting reagent is a reagent which controls the amount of formation of the product.

Complete step by step answer:
In the given question, we’ve to find out the mass of hydrochloric acid which is formed by hydrogen and chlorine gas. From a given number of moles of hydrogen and chlorine is 100 g.
We can write the balanced chemical equation for this reaction as,
${H_2} + C{l_2} \to 2HCl$
According to the reaction, one molar or 70g chlorine reacts with 1 mole of hydrogen to produce two moles or $2 \times 36.5 = 73g$ HCl
100g of chlorine will react with = $\dfrac{2}{{70}} \times 100 = 2.86g$ hydrogen.
But here, hydrogen s 100g
Therefore, chlorine is the limiting reagent and hydrogen is in excess by: $= 100 - 2.86 = 97.14g$
70g of chlorine produces 73g HCl
100g of chlorine produces $= \dfrac{{73}}{{70}} \times 100 = 104.28g$ HCl
Option A: this option is wrong because ${H_2}$ isn’t a limiting reagent.
Option B: this option is correct because $C{l_2}$ is limiting reagent and total mass formed is 104.38g is correct.
Option C: this option is wrong because H2 isn’t a limiting reagent. Therefore, the option C is incorrect.
Option D: This option is also wrong because the amount of HCl formed is wrong.
So, the correct answer is “Option B”.

Note:
We should also know about the single displacement reaction. A single displacement reaction, sometimes called a single displacement, is a reaction in which one element is substituted for another element in a compound. When a replacement reaction occurs, a new aqueous compound and different pure elements will be generated as products.