Which condition is most important when determining molar mass from lowering of vapour pressure?
Answer and explanation
Correct answer: The solute should be non-volatile
The vapour-pressure-lowering method commonly uses Raoult’s law for a solution containing a non-volatile solute. Because the solute does not contribute appreciably to the vapour phase, the lowering of the solvent’s vapour pressure can be related to the relative numbers of solute and solvent particles. Colour, magnetism, and a solid solvent are irrelevant conditions. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
The solute should be non-volatile
Why is this the correct answer?
The vapour-pressure-lowering method commonly uses Raoult’s law for a solution containing a non-volatile solute. Because the solute does not contribute appreciably to the vapour phase, the lowering of the solvent’s vapour pressure can be related to the relative numbers of solute and solvent particles. Colour, magnetism, and a solid solvent are irrelevant conditions. Therefore, option A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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