Chapter 3, Problem 3.30QP

(a)

Interpretation Introduction

Interpretation: The number of moles of sodium is to be stated.

Concept introduction: The mole is unit specially discovered for the atoms or molecules due to extreme small size and large numbers. One mole is defined as the amount of the substance which contains exactly the same number of particles as in $12\text{g}$ of carbon-12 isotope. One mole of anything consists of $N_{\text{A}}$ number of things. This number is known as Avogadro number. Every molecular formula contains exactly the same number of moles of elements as given the stoichiometric ratio in the molecular formula. In case of ion compounds the same concept is applicable.

To determine: The number of moles of sodium in one mole of $\text{NaCl}$.

(b)

Interpretation Introduction

To determine: The number of moles of sodium in one mole of ${\text{Na}}_2{\text{SO}}_4$.

(c)

Interpretation Introduction

To determine: The number of moles of the sodium in one mole of ${\text{Na}}_3{\text{PO}}_{\text{4}}$.

(d)

Interpretation Introduction

To determine: The number of moles of the sodium in one mole of ${\text{NaNO}}_{\text{3}}$.