Chapter U4.72, Problem 3E

(a)

Interpretation Introduction

Interpretation:

If to make banana bread, two ripe bananas are required, the way of utilizing 6 bananas before they go bad needs to be explained.

Concept introduction:

To consume a substance completely, another substance must be taken in a proper ratio.

Answer to Problem 3E

Three banana pieces of bread can be made so that all six bananas can be utilized before they go bad.

Explanation of Solution

One banana bread needs two ripe bananas and six ripe bananas are available which might go bad if not used. So extra two banana breads can be made. Thus total three banana breads should be made so that all the six ripe bananas are used up.

Interpretation Introduction

(b)

Interpretation:

The making of banana bread needs to be compared with balancing a chemical equation.

Concept introduction:

The chemical reaction takes place in a definite molar ratio.

Answer to Problem 3E

Balancing a chemical reaction is similar to making banana breads with all the ripe bananas available. With respect to the reagent, another reactant must be added to the definite ratio required to consume the first reactant.

Explanation of Solution

For example, one mole Zn reacts with 2 moles of HCl to produce 1 mole of ZnCl₂ and 1 mole of H₂.

$\text{Zn+2HCl}\to {\text{ZnCl}}_{\text{2}}{\text{+H}}_{\text{2}}$

In this case, if there are 6 moles of HCl available which need to be used up completely, then 3 moles of Zn must be added for the reaction.

It is similar to making banana bread in which for each banana bread, two ripe bananas are required.