   # The Mole Concept II Calculate the number of atoms in a pure gold ring weighing 17 g. ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 3.6YT
Textbook Problem
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## The Mole Concept IICalculate the number of atoms in a pure gold ring weighing 17 g.

Interpretation Introduction

Interpretation:

The number of atoms in a pure gold ring is to be calculated.

Concept Introduction:

A mole is a unit of amount of substance. It relates a number of particles to molar mass.

One mole of any substance contains Avogadro’s number, 6.022×1023, particles. The number remains constant, regardless of the nature of the substance. One mole of an atom contains 6.022×1023 atoms. One mole of molecules contains 6.022×1023 molecules.

### Explanation of Solution

Given information: Mass of pure gold ring 17 g.

The number of moles of gold is calculated as:

Molar mass of gold = 197 g/mol (from periodic table)197 g of gold contains = 1 mole17 g of gold contains = 1 mole197 g ×17g                                  = 0.086 mole

Hence, the number of moles of gold is 0.086 mole.

The number of atoms in 0.086 mole of gold is calculated as:

1 mole of gold contains = 6

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