Concept explainers
Interpretation:
The molality of the solution and mole fraction of solute is to be calculated
Concept introduction:
Molality: Molality is defined as the number of moles of solute per kg of the solvent.
In expression,
Again
Mole fraction: Mole fraction defined as the number of moles of one component divided by total the number of moles in the mixture.
The mole fraction for the solute (
Answer to Problem 83A
The molality of formic acid solution is 11.95 m and the mole fraction of formic acid in the solution is 0.177.
Explanation of Solution
Given information:
Percent by mass of formic acidsolution = 35.5
This above statement signifies that 35.5 g formic acid in 100 gm solution.
Mass of formic acid = 35.5 gm.
Calculate the number of moles of formic acids.
(Note: Molecular weight of formic acid = 46.03 gm/mol)
Calculate the mass of water.
(Note: Molecular weight of water = 18 gm/mol)
Calculate the molality of formic solution.
Calculate the molefraction of
The molality of formic acid solution is 11.95 m and the mole fraction of formic acid in the solution is 0.177.
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Glencoe Chemistry: Matter and Change, Student Edition
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