A toothpaste contains 0.24% by mass sodium fluoride used to prevent dental caries and 0.30% by...
A toothpaste contains 0.24% by mass sodium fluoride used to prevent dental caries and 0.30% by mass triclosan C12H7Cl3O2, a preservative and antigingivitis agent. One tube contains 119 g toothpaste.
a. How many moles of NaF are in the tube of toothpaste?
b. How many fluoride atoms F– are in the tube of toothpaste?
c. How many grams of sodium ion Na+ are in 1.50 g toothpaste?
d. How many molecules of triclosan are in the tube of toothpaste?
Homework Answers
To calculate number of moles of 
present in the tube of toothpaste consider
The tooth paste is 
Percentage by mass of 
is 
Molar mass of 
is 
Now. The percentage by mass is given by the equation
Rearrange for mass of 
and substitute in the above equation
Hence the mass of 
is 
.
Number of moles is given by the equation
Substitute in the above equation
Hence the number of moles of 
present in the tube of tooth paste is 
.
To calculate number of fluoride atoms present in the tube of the tooth paste.
Number of moles of 
is 
From the reaction it is clear that 
Hence the number of moles of fluoride ion is 
.
of fluoride contains Avogadro’s number of atoms. 
Hence the tube of tooth paste contains 
of fluoride.
To calculate mass of sodium ions present in of 
of toothpaste consider
The mass of tooth paste is 
Percentage by mass of 
is 
Now. The percentage by mass is given by the equation
Rearrange for mass of 
and substitute the values in the above equation
Hence mass of 
is 
.
Number of moles is given by the equation
Substitute in the above equation
Hence the number of moles of 
is 
.
Number of moles is given by the equation
Rearrange for mass and substitute in the above equation
Hence the mass of sodium ion in the tooth paste is 
.
To calculate number of molecules of triclosan in the tube of toothpaste consider
The mass of tooth paste is 
Percentage by mass of triclosan is 
Molar mass of triclosan is 
The percentage by mass is given by the equation
Rearrange for mass of triclosan and substitute the values in the above equation
Hence mass of triclosan is 
.
Number of moles is given by the equation
Substitute in the above equation
Hence the number of moles of triclosan is 
.
of triclosan contains Avogadro’s number of atoms. 
Hence the tube of tooth paste contains 
of triclosan.
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A toothpaste contains 0.24% by mass sodium fluoride used to prevent dental caries and 0.30% by...
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A toothpaste contains 0.242 %% by mass sodium fluoride used to prevent dental caries and 0.31 %% by mass triclosan C12H7Cl3O2C12H7Cl3O2, an antigingivitis agent. One tube contains 119 g of toothpaste. (Figure 1) How many fluoride ions, F−, are in the tube of toothpaste? How many grams of sodium ion, Na+, are in 1.80 g of toothpaste? How many molecules of triclosan are in the tube of toothpaste?
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