
Interpretation: The mass percentages in the sample have to be calculated.
Concept introduction: The mass percentage of a compound can be calculated with the calculated mass of the compound to the total mass of the compound.

Answer to Problem 141CP
Answer
The mass of
Explanation of Solution
Explanation
Record the given data
Mass of the sample mixture =
Mass of the precipitate =
The mass of the sample mixture and mass of the precipitate are recorded as shown above.
To calculate the mass of
Molar mass of
Molar mass of
Mass of
=
The mass of
To calculate the mass percent of
Mass of
Mass percent of
=
The mass percent of
To calculate the mass of
Molar mass of
Molar mass of
Assume
Hence,
Let x= mass of
y= mass of
In
Total mass of
Solving equation (1) and (2),
Therefore,
The mass of
To calculate the mass percent of
Assume total mass =
The mass percent of
Conclusion
The mass and mass percent of
The mass percent of
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