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A solution is prepared by dissolving 0.131 g of a substance in 25.4 g of water. The molality of the solution is determined by freezing point
depression to be 0.056 m. What are the moles of the substance?

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Eduard22sly

The mole of the substance, given the data from the question is 0.0014 mole

What is molality?

This is simply defined as the mole of solute per kilogram of water. Mathematically, it is expressed as

Molality = mole / mass (Kg) of water

How to determine the mole of the substance

  • Mass of water = 25.4 g = 25.4 / 1000 = 0.0254 Kg
  • Molality = 0.056 m
  • Mole of substance =?

Mole = molality × mass of water

Mole of substance = 0.056 × 0.0254

Mole of substance = 0.0014 mole

Thus, the mole of the substance is 0.0014 mole

Learn more about Molality:

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