Chapter 11, Problem 76A

Interpretation Introduction

Interpretation:

From the given figure limiting and excess reactant needs to be determined.

Concept introduction:

The reactant which is completely consumed in the reaction is a limiting reactant and the reactant which remains after the completion of the reaction is reactant in excess.

Answer to Problem 76A

Hydrogen is limiting reactant and Ethyne is excess reactant.

Explanation of Solution

Given information : Information provided in figure shows ethyne reacts with hydrogen to produce ethane. This is an example of hydrogenation reaction.

The balanced equation is given below

$\text{C2H2+2H2}\to \text{C2H6}$

According to stoichiometry of reaction one molecule of ethyne require 2 molecules of hydrogen. In figure two molecule of each reactant is given. So ethyne is given in excess and it left over after reaction. There is no hydrogen left.

From this one can conclude that ethyne is an excess reactant and Hydrogen is limiting reagent.

Conclusion

From this one can conclude that ethyne is an excess reactant and Hydrogen is limiting reagent.