
To find:
Which two hydrocarbons with the molecular structures shown in Figure P7.5 have the same percent composition?

Answer to Problem 7.5VP
Solution:
Molecules (b)
Explanation of Solution
1) Formula:
Percent composition is the percent by mass of an element in a compound:
2) Calculations:
In the given Figure P7.5 black sphere represents
a) Molecule (a) contains six
b) Molecule (b) contains two
c) Molecule (c) contains three
d) Molecule (d) contains six
Therefore, molecule (b) and (d) have same percent composition.
Conclusion:
First, we calculate the mass of the number of atoms of C and H, and then calculate the percent composition of C and H using molecular mass of compound.
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Chapter 7 Solutions
Chemistry: An Atoms-Focused Approach
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