Molality of an aqueous solution having mole fraction of solvent as 0.95 is approximately
Answers
Molality: Molal concentration is the measurement of the degree of concentration of a solute in a solution. Molal concentration is also called molality.
Given:
Aqueous solution
Mole fraction = 0.95
Formula:
Molality = Mass of solute / Molar mass solute.
The solution is aqueous and so, the sum of mole fractions is always 1.
If the mole fraction of solvent is 0.95 then,
Mole fraction of solute = 1 - 0.95 = 0.05
Moles of solute and solvent,
Mole fraction of solute = solutemol/solutionmol
Therefore,
Solute mol = 0.05
Solvent mol = 0.95
Molar mass of water is 18 gram per mole.
To convert moles to grams,
0.95(18/1) = 16.8 grams
To convert gram to kilogram,
16.8(1/1000) = 0.016 kg
Molality of the solution = 0.05/0.016
Therefore,
Molality ≅2.94 m
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