Chapter 3, Problem 3.17P

(a)

Interpretation Introduction

Interpretation:

Total number of ions in $38.1\text{ g}$ of $\text{Sr}\text{}{\text{F}}_2$ is to be calculated.

Concept introduction:

The molar mass of a substance is defined as the mass of one mole of a chemical entity. It is calculated as the summation of the product of the number of atoms of each element and the atomic mass of the respective element.

For example, the molar mass of $\text{NaCl}$ is calculated as follows.

$\text{Molar Mass of NaCl}=\left[\begin{array}{l}\left(\text{number of Na atoms}\right)\left(\text{atomic mass}\text{of Na}\right)\\ +\left(\text{number of Cl atoms}\right)\left(\text{atomic}\text{mass}\text{of Cl }\right)\end{array}\right]$ (1)

A mole is a unit of measurement that has the same number of particles as that in $12.000\text{ g}$ of $\text{carbon}-\text{12}$. One mole of a chemical substance (atoms/molecules/ions) has $6.022\times {10}^{23}$ number of entities.

(b)

Interpretation Introduction

Interpretation:

Mass (kg) of $\text{3}\text{.58 mol}$ of ${\text{CuCl}}_{\text{2}}\cdot {\text{2H}}_{\text{2}}\text{O}$ is to be calculated.

Concept introduction:

The molar mass of a substance is defined as the mass of one mole of a chemical entity. It is calculated as the summation of the product of the number of atoms of each element and the atomic mass of the respective element.

For example, the molar mass of $\text{NaCl}$ is calculated as follows.

$\text{Molar Mass of NaCl}=\left[\begin{array}{l}\left(\text{number of Na atoms}\right)\left(\text{atomic mass}\text{of Na}\right)\\ +\left(\text{number of Cl atoms}\right)\left(\text{atomic}\text{mass}\text{of Cl }\right)\end{array}\right]$ (1)

The conversion factor for $\text{g}$ into $\text{kg}$ is given as.

$\text{Mass }\left(\text{kg}\right)=\left(\text{Mass}\left(\text{g}\right)\right)\left(\frac{\text{1 kg}}{{\text{10}}^{\text{3}}\text{g}}\right)$ (6)

(c)

Interpretation Introduction

Interpretation:

Mass (mg) of $\text{2}\text{.88}\times {\text{10}}^{\text{22}}$ formula units of $\text{Bi}{\left({\text{NO}}_{\text{3}}\right)}_{\text{3}}\cdot {\text{5H}}_{\text{2}}\text{O}$ is to be calculated.

Concept introduction:

The molar mass of a substance is defined as the mass of one mole of a chemical entity. It is calculated as the summation of the product of the number of atoms of each element and the atomic mass of the respective element.

For example, the molar mass of $\text{NaCl}$ is calculated as follows.

$\text{Molar Mass of NaCl}=\left[\begin{array}{l}\left(\text{number of Na atoms}\right)\left(\text{atomic mass}\text{of Na}\right)\\ +\left(\text{number of Cl atoms}\right)\left(\text{atomic}\text{mass}\text{of Cl }\right)\end{array}\right]$ (1)

The conversion factor for $\text{g}$ into $\text{mg}$ is given as.

$\text{Mass }\left(\text{mg}\right)=\left(\text{Mass}\left(\text{g}\right)\right)\left(\frac{\text{1 mg}}{{\text{10}}^{-3}\text{g}}\right)$ (9)