   Chapter 19.8, Problem 19.11CYU

Chapter
Section
Textbook Problem

1. Calculate the mass of O2 produced in the electrolysis of water, using a current of 0.445 A for a period of 45 minutes.2. In the commercial production of sodium by electrolysis, the cell operates at 7.0 V and a current of 25 × 103 A. What mass of sodium can be produced in 1 hour?

(1)

Interpretation Introduction

Interpretation:

Calculate mass of O2 producedin in  the electrolysis of water.

Concept introduction:

Electrolysis:

It is a decomposition of ionic compounds by passing electricity through molten compounds or aqueous solutions of compounds.

Electricity used to produce chemical changes. The apparatus used for electrolysis is called an electrolytic cell.

Current:

Rate of the charge changing in time is termed as current.

The formula is as follows.

Current (Amperes, A) = Electric charge (Coloumbs, C)time, t(seconds,s)

Simplify as follows.

Current = Electric charge time

To rearrange the above formula is as follows:

Charge = Current(A) × time(s)

Explanation

Let’s calculate the charge passing through the cell in 45 min.

Charge = Current(A) × time(s)Current = 0.445 Atime = 45 min × 60.0sec. min-1

Substitute the values, we get charge of the cell.

Charge = (0.445 A) × (45 min)(60.0 sec.min-1)=1.201 × 103 C

Let’s calculate the moles electrons:

1mole = (1.201 × 103 C)(1 mol e-96500 C)= 1

(2)

Interpretation Introduction

Interpretation:

The mass of Na produced in 1hr by has to be determined.

Concept introduction:

Electrolysis:

It is a decomposition of ionic compounds by passing electricity through molten compounds or aqueous solutions of compounds.

Electricity used to produce chemical changes. The apparatus used for electrolysis is called an electrolytic cell.

Current:

Rate of the charge changing in time is termed as current.

The formula is as follows.

Current (Amperes, A) = Electric charge (Coloumbs, C)time, t(seconds,s)

Simplify as follows.

Current = Electric charge time

To rearrange the above formula is as follows:

Charge = Current(A) × time(s)

To rearrange the above formula is as follows.

Charge = Current(A) × time(s)

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