Problem 119
Page 121
Section: Challenge Problems
Chapter 3: Molecules, Compounds, and Chemical Equations
Given information
The mass percent of the element is .
The mass percent of the element is .
The atomic mass of is twice that of .
Step-by-step explanation
The percentage of and is given, assuming that the total mass is .
This means that the mass of each element is equal to the given percent.
Therefore, the mass of element is , and for is .
The atomic mass of is twice that of .
Assuming that atomic mass of is .
Therefore, atomic mass of is .
The formula to calculate number of moles is,
Where,
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is the number of moles.
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is the given mass of the compound.
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is the molar mass of the compound.
Substitute the value of molar mass in the above formula.
The number of moles for the element is,
The number of moles for the element is,
Therefore, the number of moles for the element is , and for the element is .