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Chemistry In Focus

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

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 51E
Textbook Problem
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How many Ag atoms are present in a piece of pure silver jewelry weighing 21.3 g?

Interpretation Introduction

Interpretation:

The number of Ag atoms in pure silver jewelry with given mass is to be calculated.

Concept Introduction:

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

 One mole of a substance contains Avogadro’s number, that is, 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.

 It also relates to the molar mass of a substance in grams. One mole of a substance weighs that amount in grams, which is equal to its molar mass.

Explanation of Solution

Given information: The mass of pure silver jewelry is 21.3 g.

The number of atoms in Ag is calculated as follows:

The molar mass of Ag is 107.9 g.

6.022 ×1023 atoms of Ag = 1 mole of Ag = 107.9 g107.9 g of Ag contains = 6.022 ×1023 atoms of Ag

Therefore,

21.3 g of Ag contains = 21

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Chemistry In Focus
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