Interpretation:
The molality of each of the given aqueous solutions is to be calculated.
Concept introduction:
Molality is the ratio of thenumber of moles of solute to the mass of the solvent in
The formula to calculate molality
Moles
Answer to Problem 19QP
Solution:
a)
b)
c)
Explanation of Solution
a)
The molarity of the sugar solution is
The density of the solution is
Calculate the mass of the solution as follows:
Rearrange the equation (2) for mass as follows:
The molar mass of sugar
Substitute
Now, calculate the mass of the solvent as follows:
Substitute
The relation between
Convert
Substitute
b)
The molarity of
The density of the solution is
The mass of the solution as follows:
Rearrange the equation (2) for mass as follows:
The molar mass of
Substitute
Now, calculate the mass of the solvent as follows:
Substitute
The relation between
Convert
Substitute
c)
The molarity of
The density of the solution is
Calculate the mass of the solution as follows:
Rearrange the equation (2) for mass.
The molar mass of
Substitute
Now, calculate the mass of solvent using the expression shown below:
Substitute
The relation between
Convert
Substitute
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Chapter 13 Solutions
Student Study Guide for Chemistry
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