. What is relative lowering of vapour pressure


How is it useful to determine the molar - mass of a solute?

 

Best Answer

Explanation:

When the solute molecules are non-volatile, then the solution contains only vapour of solvent molecules above it.

 When solute is added into it , the vapour pressure of the solution is lower than  pure liquid at a given temperature. 

This is known as relative lowering of vapour pressure. 

vapour pressure

solute respectively. M1 ​ and M2 ​ are the molar masses of solvent and solute respectively.
Final Answer:When the solute molecules are non-volatile, then the solution contains only vapour of solvent molecules above it.

 When solute is added into it , the vapour pressure of the solution is lower than  pure liquid at a given temperature.

 

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