Answer :
The molality of the solution made by dissolving 4.08 g of hexane in 89.1 g of benzene is 0.527 M
What is molality?
This is simply defined as the mole of solute per kilogram of solvent. It can be expressed mathematically as:
Molality = mole of solute / mass (in Kg) of solvent
How to determine the mole of hexane
- Mass of hexane = 4.08 g
- Molar mass of hexane = 86 g/mol
- Mole of hexane =?
Mole = mass / molar mass
Mole of hexane = 4.08 / 86
Mole of hexane = 0.047 mole
How to determine the molality of the solution
The molality of the solution can be obtained as illustrated below:
- Mole of solute (hexane) = 0.047 mole
- Mass of solvent (benzene) = 89.1 g = 89.1 / 1000 = 0.0891 Kg
- Molality =?
Molality = mole of solute / mass (in Kg) of solvent
Molality = 0.047 / 0.0891
Molality = 0.527 M
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