Chemistry: An Atoms-Focused Approach
Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
Question
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Chapter 2, Problem 2.54QA
Interpretation Introduction

To find:

The number of hydrogen atoms in one molecule of (a) CH4; (b) C3H8; (c) C6H6; and (d) C6H12O6.

Expert Solution & Answer
Check Mark

Answer to Problem 2.54QA

Solution:

(a) CH4: The number of hydrogen atoms is 4.

(b) C3H8: The number of hydrogen atoms is 8.

(c) C6H6: The number of hydrogen atoms is 6.

(d) C6H12O6: The number of hydrogen atoms is 12.

Explanation of Solution

Avogadro’s number is equal to 6.022*1023 atoms or molecules.

1 mole = 6.022*1023 molecules.

a) CH4 Here we can use Avogadro’s number as a conversion factor to calculate number of hydrogen atoms in 1 molecule of CH4.

1 molecule CH4 × 1 mole CH46.023×1023 molecule ×4 mole H1 mole CH4×6.023×1023H atoms 1 mole H= 4 atoms of hydrogen

(b)  C3H8 - Here we can use Avogadro’s number as a conversion factor to calculate number of hydrogen atoms in 1 molecule of C3H8.

1 molecule C3H8 × 1 mole C3H86.023×1023 molecule ×8 mole H1 mole C3H8×6.023×1023H atoms 1 mole H= 8 atoms of hydrogen

(c) C6H6 - Here we can use Avogadro’s number as a conversion factor to calculate number of hydrogen atoms in 1 molecule of C6H6.

1 molecule C6H6 × 1 mole C6H66.023×1023 molecule ×6 mole H1 mole C6H6×6.023×1023H atoms 1 mole H= 6 atoms of hydrogen

(d) C6H12O6 - Here we can use Avogadro’s number as a conversion factor to calculate number of hydrogen atoms in 1 molecule of C6H12O6.

1 molecule C6H12O6 × 1 mole C6H12O66.023×1023 molecule ×12 mole H1 mole C6H12O6×6.023×1023H atoms 1 mole H= 12 atoms of hydrogen

Conclusion:

The number of hydrogen atoms can be calculated by using Avogadro’s number.

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Chapter 2 Solutions

Chemistry: An Atoms-Focused Approach

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