   # 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. ### Chemistry: Principles and Reactions

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

#### Solutions

Chapter
Section ### 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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