
Concept explainers
Calculate the molalities of the following aqueous solutions: (a) 0.988 M sugar (C12H22O11) solution (density of solution = 1.095 g/mL), (b) 1.12 M NaOH solution (density of solution = 1.082 g/mL), (c) 2.98 M NaHCO3 solution (density of solution = 1.077 g/mL).
(a)

Interpretation: For the following aqueous solutions molality to be calculated.
Concept introduction:
Molality (m): Molality is the number of moles of solute present in one kilogram of solvent. Molality is estimation of moles in relationship with solvent in the solution.
Answer to Problem 13.19QP
Molality of
Explanation of Solution
Given data
Strength of sugar solution =
Density of sugar solution =
Molality of the solution =?
Calculation of mass of sugar
Molecular weight of sugar =
By plugging in the value of strength of sugar and molecular mass of sugar, mass of sugar has calculated.
Calculation of mass of sugar solution
Each case consider 1 L of solution
By multiplying the value of density of sugar and one litter of sugar solution, mass of one liter solution has been calculated.
Calculation of molality of the solution
By plugging the value of moles of sugar and amount of solvent (water) into molality formula, the molality of the solution has calculated.
(b)

Interpretation: For the following aqueous solutions molality to be calculated.
Concept introduction:
Molality (m): Molality is the number of moles of solute present in one kilogram of solvent. Molality is estimation of moles in relationship with solvent in the solution.
Answer to Problem 13.19QP
Molality of
Explanation of Solution
Given data
Strength of Sodium hydroxide solution =
Density of Sodium hydroxide solution =
Molality of the solution =?
Calculation of mass of
By plugging the value of molecular mass and strength of Sodium hydroxide, mass of
Calculation of molality of the solution
By plugging the value of moles of Sodium hydroxide and amount of solvent (water) into molality formula, the molality of the solution has calculated.
(c)

Interpretation: For the following aqueous solutions molality to be calculated.
Concept introduction:
Molality (m): Molality is the number of moles of solute present in one kilogram of solvent. Molality is estimation of moles in relationship with solvent in the solution.
Answer to Problem 13.19QP
Molality of
Explanation of Solution
Given data
Given data
Strength of Sodium bicarbonate solution =
Density of Sodium bicarbonate solution =
Molality of the solution =?
Calculation of mass of
By plugging the value of molecular mass and strength of Sodium bicarbonate, mass of
Calculation of molality of the solution
By plugging the value of moles of Sodium bicarbonate and amount of solvent (water) into molality formula, the molality of the solution has calculated.
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Chapter 13 Solutions
Chemistry: Atoms First
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