Chapter 9, Problem 72A

(a)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: While naming a molecular compound the name of the first element is named first followed by that of the second element. The number of atoms of each element present in the compound is added as a prefix.

Answer to Problem 72A

The name of the given compound is diphosphorus pentoxide.

Explanation of Solution

Given compound contains two phosphorous atoms and five oxygen atoms, the name of the first element phosphorous with the prefix ‘di’ is written followed by the name of the second compound oxide with the prefix ‘penta’.

(b)

Interpretation Introduction

Interpretation: The name of the given compound needs to be stated.

Concept Introduction: While naming a molecular compound the name of the first element is named first followed by that of the second element. The number of atoms of each element present in the compound is added as a prefix.

Answer to Problem 72A

The name of the given compound is carbon tetrachloride.

Explanation of Solution

Given compound contains a carbon atom and four chlorine atoms, hence the name carbon tetrachloride. The prefix ‘tetra’ is used to denote four.

(c)

Interpretation Introduction

Interpretation: The formula of the given compound needs to be stated.

Concept Introduction: While naming a molecular compound the name of the first element is named first followed by that of the second element. The number of atoms of each element present in the compound is added as a prefix.

Answer to Problem 72A

The formula of boron trichloride is ${\text{BCl}}_{\text{3}}$ .

Explanation of Solution

The symbol of the first element is written followed by the second element. Since there are three chlorine atoms, subscript 3 is written.

(d)

Interpretation Introduction

Interpretation: The formula of the given compound needs to be stated.

Concept Introduction: While naming a molecular compound the name of the first element is named first followed by that of the second element. The number of atoms of each element present in the compound is added as a prefix.

Answer to Problem 72A

The compound dinitrogen tetrahydride can be represented by the chemical formula ${\text{N}}_{\text{2}}{\text{H}}_{\text{4}}$ .

Explanation of Solution

In the given compound, there are two nitrogen atoms and four hydrogen atoms. It is represented by writing their symbols with corresponding subscripts.