
To calculate:
The percent composition of the following compounds
a) Sodium sulfate
b) Dinitrogen tetroxide
c) Strontium nitrate
d) Aluminum sulfide

Answer to Problem 7.48QA
Solution:
Percent composition of each element in a given compound is:
a) Sodium sulfate contains
b) Dinitrogen tetroxide contains
c) Strontium nitrate contains
d) Aluminum sulfide contains
Explanation of Solution
1) Concept:
We have to find the percent composition compound of the given compounds. The chemical formula of each of the given compounds is
The chemical formula tells us the ratio of moles of each elements in the formula. For example: one mole of
A mole is the SI unit of amount chemical substance. When writing units, it is written as “mol”.
2) Formula:
3) Given:
Chemical names for four compounds are given as:
a) Sodium sulfate
b) Dinitrogen tetroxide
c) Strontium nitrate
d) Aluminum sulfide
4) Calculations:
Calculating mass of each of the given compounds as follows:
a) Calculating mass of
Molar mass of
Calculating percent composition of
b) Calculating mass of
Molar mass of
Calculating percent composition of
c) Calculating mass of
Molar mass of
Calculating percent composition of
d) Calculating mass of
Molar mass of
Calculating percent composition of
Conclusion:
We can find the percent composition of each element present in a given compound by using atomic weights and mole ratio.
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Chapter 7 Solutions
Chemistry: An Atoms-Focused Approach
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