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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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