Chapter 2, Problem 2.68P

a)

Interpretation Introduction

Interpretation:Correct molecular formula of barium oxide should be given.

Concept introduction:In the molecular formula, the exact number and type of constituent atoms are shown. Type of constituent atoms is represented by their atomic symbols and the number of each constituent atom is represented by the right subscript of its atomic symbol. The number of each constituent in a molecule depends on its valency. The valency of an element is calculated from its electronic configuration, that is how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , the ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ .

b)

Interpretation Introduction

Interpretation:Correct molecular formula of $\text{iron}\left(\text{II}\right)\text{nitrate}$ should be given.

Concept introduction:In the molecular formula, the exact number and type of constituent atoms are shown. Type of constituent atoms is represented by their atomic symbols and the number of each constituent atom is represented by the right subscript of its atomic symbol. The number of each constituent in a molecule depends on its valency. The valency of an element is calculated from its electronic configuration, that is how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , the ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ .

c)

Interpretation Introduction

Interpretation:Correct molecular formula of magnesium sulfide should be given.

Concept introduction:In the molecular formula, the exact number and type of constituent atoms are shown. Type of constituent atoms is represented by their atomic symbols and the number of each constituent atom is represented by the right subscript of its atomic symbol. The number of each constituent in a molecule depends on its valency. The valency of an element is calculated from its electronic configuration, that is how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , the ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ .