Chapter 17, Problem 78QAP

Interpretation Introduction

(a)

Interpretation:

The number of electrons during the electrolysis process needs to be calculated.

Concept introduction:

Avogadro’s number is the number of units in 1 mole of every substance which is equal to $6\cdot 022\times {10}^{23}$. It is denoted as ${\text{N}}_{\text{A}}$.

${\text{N}}_{\text{A}}=6\cdot 022\times {10}^{23}$

Interpretation Introduction

(b)

Interpretation:

The number of coulombs during electrolysis process needs to be calculated.

Concept introduction:

Faraday’s constant (F) is defined as charge in Coulomb of 1 mole electron.

$\text{F}=9\cdot 648\text{C}$

Value of Faraday’s constant can be calculated by multiplying charge of one electron with Avogadro’s number.

$\begin{array}{c}\text{F=Charge}\text{of}\text{one}\text{electron×Avogadro’s}\text{number}\\ \text{=1}\text{.602}\times {\text{10}}^{-19}\text{C}\times \text{6}\text{.022}\times {\text{10}}^{23}\\ =9.648\times {10}^4\text{C}\end{array}$

Interpretation Introduction

(c)

Interpretation:

The mass of ${\text{Cl}}_{\text{2}}\text{and}{\text{H}}_{\text{2}}$ needs to be calculated.

Concept introduction:

Formula to calculate mass is as follows:

$\begin{array}{c}\text{No}\text{.of}\text{moles=}\frac{\text{Mass}}{\text{Molar}\text{mass}}\\ \text{Mass}=\text{No}\text{.of}\text{moles}\times \text{Molar}\text{mass}\end{array}$