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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 4, Problem 42E
Textbook Problem
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How many hydrogen atoms are in each of the following?

a . 5 H 2 O molecules b . 58 CH 4  molecules c . 1 .4  ×  10 22 C 12 H 22 O 11  molecules d . 14 dozen NH 3  molecules

Interpretation Introduction

Interpretation:

The number of hydrogen atoms is to be determined in the given molecules.

Concept Introduction:

The characteristic mass of a compound is considered as the formula mass of the compound, which is obtained by adding the atomic masses of all the atoms.

A conversion factor is considered a numerical ratio in order to change one unit into another.

A chemical formula represents the precise number of atoms in a molecule, but not their structural arrangement.

Explanation of Solution

a) 5H2Omolecules

The equivalence is obtained between 5H2Omolecules and atoms of hydrogen with the help of the chemical formula as follow:

2atoms H1molecule H2O

In order to obtain atoms of hydrogen, the conversion factor proceeds as follows:

5H2Omolecules×2H atoms1H2Omolecule=10H atoms

Therefore, the number of hydrogen atoms is 10.

b) 58CH4molecules

The equivalence is obtained between 58CH4molecules and atoms of hydrogen with the help of the chemical formula as follow:

4atoms H1molecule CH4

In order to obtain atoms of hydrogen, the conversion factor proceeds as follows:

(58CH4molecules)×(4H atoms1CH4molecule)=232H atoms

Therefore, the number of hydrogen atoms is 232.

c) 1.4×1022C12H22O11molecules

The equivalence is obtained between 1.4×1022C12H22O11molecules and atoms of hydrogen with the help of the chemical formula as follow:

22atoms H1molecule C12H22O11

In order to obtain atoms of hydrogen, the conversion factor proceeds as follows:

1

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Chemistry In Focus
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