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Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373

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Chapter
Section
BuyFindarrow_forward

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373
Chapter 3, Problem 3QAP
Textbook Problem
163 views

Determine

(a) the mass of 0.429 mol of gold.

(b) the number of atoms in 0.715 g of gold.

(c) the number of moles of electrons in 0.336 g of gold.

Interpretation Introduction

(a)

Interpretation:

The mass of 0.429 mol of gold should be calculated.

Concept introduction:

The number of moles of a substance is related to mass and molar mass as follows:

n=mM

Here, m is mass and M is molar mass of the substance.

Also, according to Avogadro’s law in 1 mol of a substance there are 6.023×1023 units of that substance. Here, 6.023×1023 is known as Avogadro’s number and denoted by symbol NA.

Explanation of Solution

The number of moles of gold is 0.429 mol. The number of moles is related to mass as follows:

n=mM

On rearranging,

m=n×M

Molar mass (atomic mass) of gold can be seen from periodic table which is 197 g/mol.

Putting the values,

m=(0

Interpretation Introduction

(b)

Interpretation:

The number of atoms in 0.715 g of gold should be calculated.

Concept introduction:

The number of moles of a substance is related to mass and molar mass as follows:

n=mM

Here, m is mass and M is molar mass of the substance.

Also, according to Avogadro’s law in 1 mol of a substance there are 6.023×1023 units of that substance. Here, 6.023×1023 is known as Avogadro’s number and denoted by symbol NA.

Interpretation Introduction

(c)

Interpretation:

The number of moles of electrons in 0.336 g of gold should be calculated.

Concept introduction:

The number of moles of a substance is related to mass and molar mass as follows:

n=mM

Here, m is mass and M is molar mass of the substance.

Also, according to Avogadro’s law in 1 mol of a substance there are 6.023×1023 units of that substance. Here, 6.023×1023 is known as Avogadro’s number and denoted by symbol NA.

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Chapter 3 Solutions

Chemistry: Principles and Reactions
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