Chapter 7, Problem 7.114UTC

(a)

Interpretation Introduction

Interpretation: To write a balance equation for the following reaction:

Concept Introduction:

Mass can neither be created nor be destroyed.

A chemical reaction should be well balance i.e. the number of atoms of each element in reactant side must be equal to number of atoms in product side.

  $2\text{HCl+}{\text{F}}_{\text{2}}\to {\text{Cl}}_{\text{2}}+2\text{HF}$

Here we have:

According to question,

Green spheres = Chlorine atom

Yellow green sphere = Fluorine atom

White sphere = Hydrogen atom

Then chemical reaction will look like:

  $\text{2HCl+}3F_{\text{2}}\to 2H{F}_{}{\text{+Cl}}_{\text{2}}+2F_{\text{2}}$

Now, we must cancel out the common molecules which are present in both reactant and product side.

Overall reaction will look like:

  $\text{2HCl+}{\text{F}}_{\text{2}}\to 2{\text{HF+Cl}}_{\text{2}}$

(b)

Interpretation Introduction

Interpretation: To determine the limiting reactant in the following reaction:

Concept Introduction:

Limiting reactant = in a chemical reaction, limiting reactant refers to that reactant which limits the amount of product formed.

When limiting reactant finished during a chemical reaction, reaction stops and there will be no further formation of products.