According to Raoult's law relative lowering of vapour pressure for a solution is equal to:
Correct answer: B. Mole fraction of the solute
- A. mole fraction of the solvaent
- B. Mole fraction of the solute
- C. Moles of a solvant
- D. Moles of the solvent
Explanation
According to Raoult's law, the relative lowering of vapor pressure is equal to the mole fraction of the solute in the solution.Raoult's law describes the relationship between the vapor pressure of a solvent in a solution and the vapor pressure of the pure solvent. It states that the relative lowering of vapor pressure (Δp/Ppure is equal to the mole fraction of the solute (x solute ).Mathematically, it can be expressed as:Δp/ Ppure =x solute
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About Colligative Properties
Colligative properties depend on the number of dissolved particles rather than their chemical identity. The topic covers relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure, including electrolyte dissociation, the van’t Hoff factor and molar-mass calculations.
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