Chapter 2, Problem 2.77P

a)

Interpretation Introduction

Interpretation:The molecular formula of sodium dichromateshould be written. Also, molecular mass of sodium dichromateis to be determined.

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 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, whichis how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ . Molecular mass is the sum of atomic masses of all atoms in a molecule.

b)

Interpretation Introduction

Interpretation:Molecular formula of ammonium perchlorate ${\text{NH}}_4{\text{ClO}}_4$ should be given .Also.molecular mass of ammonium perchlorate ${\text{NH}}_4{\text{ClO}}_4$ is to be determined.

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 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, which is how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ . Molecular mass is the sum of atomic masses of all atoms in a molecule.

c)

Interpretation Introduction

Interpretation:The molecular formula of magnesium nitrite trihydrate should be given. Also, molecular mass of magnesium nitrite trihydrate is to be determined.

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 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, which is how many electrons it can lose or gain to attain a stable electronic configuration.

In a hypothetical molecule ${\text{A}}_{\text{x}}{\text{B}}_{\text{y}}$ , ratio of the valency of $\text{A}$ and valency of $\text{B}$ is $\text{y}:\text{x}$ . Molecular mass is the sum of atomic masses of all atoms in a molecule.