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