Chapter 8, Problem 124A

Interpretation Introduction

(a)

Interpretation:

The chemical formula of chlorine monoxide is to be written.

Concept introduction:

In the molecular formula, the element symbols and the number of the subscript tells the type and the number of each atom in a molecule.

Answer to Problem 124A

The chemical formula of chlorine monoxide is $\text{ClO}$.

Explanation of Solution

The name “chlorine monoxide” is made up of two words “chlorine” and “monoxide”. The “monoxide” indicates that it has only one oxygen atom and the word “chlorine” indicates one atom of chlorine. Therefore, the chemical formula of “chlorine monoxide” is $\text{ClO}$.

Interpretation Introduction

(b)

Interpretation:

The chemical formula of arsenic acid is to be written.

Concept introduction:

In the molecular formula, the element symbols and the number of the subscript tells the type and the number of each atom in a molecule.

Answer to Problem 124A

The chemical formula of arsenic acid is ${\text{H}}_{\text{3}}{\text{AsO}}_{\text{4}}$.

Explanation of Solution

The given molecule is arsenic acid. Arsenic acid is an oxyacid which is made up of arsenic (As), hydrogen (H), and oxygen (O) atoms. Here, suffix “ic” in arsenic indicates that it has arsenate ion $\left({\text{AsO}}_{\text{4}}^{\text{3}-}\right)$. Therefore, the chemical formula of arsenic acid is ${\text{H}}_{\text{3}}{\text{AsO}}_{\text{4}}$.

Interpretation Introduction

(c)

Interpretation:

The chemical formula of phosphorous pentachloride is to be written.

Concept introduction:

In the molecular formula, the element symbols and the number of the subscript tells the type and the number of each atom in a molecule.

Answer to Problem 124A

The chemical formula of phosphorous pentachloride is ${\text{PCl}}_{\text{5}}$.

Explanation of Solution

The name “phosphorous pentachloride” is made up of two words “phosphorous” and “pentachloride”. The “pentachloride” indicates that it has five chlorine atoms and the word “phosphorous” indicates one atom of phosphorous. Therefore, the chemical formula of “phosphorous pentachloride” is ${\text{PCl}}_5$.

Interpretation Introduction

(d)

Interpretation:

The chemical formula of hydrosulfuric acid is to be written.

Concept introduction:

In the molecular formula, the element symbols and the number of the subscript tells the type and the number of each atom in a molecule.

Answer to Problem 124A

The chemical formula of hydrosulfuric acid is ${\text{H}}_{\text{2}}\text{S}$.

Explanation of Solution

The given molecule is hydrosulfuric acid. Hydrosulfuric acid is a binary acid which is made up of “hydro”, “sulfur”, “ic” and “acid”. The name of the binary acid is named as hydro, name of the second element, ic then acid. Therefore, the name of hydrosulfuric acid is ${\text{H}}_{\text{2}}\text{S}$.