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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 46E
Textbook Problem
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How many moles are there in each sample?

a. 55.0 g Ti

b. 16.9 mg Na

c. 7 .95  ×  10 24 Ne atoms

d. 25 Xe atoms

Interpretation Introduction

Interpretation:

The number of moles present in each sample is to be calculated.

Concept Introduction:

Mole is the unit of the amount of a substance. It relates the number of particles to the molar mass.

One mole of a substance contains Avogadro number (6.022×1023) of 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 a molecule contains Chemistry In Focus, Chapter 3, Problem 46E molecules.

It also relates to the molar mass of substance in grams. The weight of one mole of a substance is equivalent to its molar mass in grams.

To sum up, 1 mole of a substance contains 6.022×1023 particles and weighs the same as its molar mass in grams

Explanation of Solution

a) 55 g Ti

The calculation for the moles of Ti is as follows:

Molar mass of Ti is 41.88 g.

Number of moles=given massmolar mass

Substitute the values in the above equation:

Hence, the number of moles in Ti is 1.15 mol.

b)16.9 mg Na

Conversion of the mass of Na from mg to g is as follows:

Mass of Na = 16.9 mg1000 mg = 1 g

The number of moles of Na is calculated as follows:

Molar mass of Na is 23 g.

Number of moles=given massmolar mass

Substitute the values in the above equation:

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Chapter 3 Solutions

Chemistry In Focus
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