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Lao
Professor
DevinPartial molal quantities refer to the amount of a substance in a mixture per unit change in the composition of the mixture. Partial molar quantities refer to the change in the extensive properties of a solution per mole of a component added. Both terms are used to describe the behavior of components in a mixture, but they differ in the way they quantify the changes.
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How much is a molal?
A molal is a unit of concentration that represents the number of moles of solute per kilogram of solvent. It is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms.
What is is the molality of 3.00 of NaCL and 1.50kg?
m = moles/kg = 3.00/1.50 = 2.00 molal
How many grams of HCl must be dissolved in 275.0 g of water to prepare a 1.5 molal solution?
The answer is 15,039 g hydrogen chloride (HCl).
How many moles of urea 60.0 g mol must be dissolved in 100.0g of water to give a 2.5 molal solution?
The answer is 15,015 g.
When you dissolve a solute into water does the boiling point go up?
Yes. This is a known colligative property and the b.p. will go up by 0.52ºC for every molal concentration of solute times the number of particles in the solute (van't Hoff factor).
