
If 6 g. of the urea dissolved in g. of boiling water. The vapour pressure of the solution is:
Answer
516.3k+ views
Hint: Rault’s law states that the vapor pressure of a solution of a non-volatile solute is equivalent to the vapor pressure of the pure solvent at that temperature multiplied by its mole fraction. It can be expressed by the following formula:
Vapour pressure Boiling point of pure solvent and x being the mole fraction of the solvent.
Complete step by step answer:
We know,
mm of Hg
Mole fraction of solvent =
To find the number of moles of urea (solute) and water (solvent):
Number of moles =
Given the mass of urea
Molar mass of urea
Moles of urea( )
Given mass of water
Molar mass of water
Moles of water( )
Now, to find the vapour pressure of solution we apply the formula:
Substituting values in the formula:
Now,
Vapour pressure of solution mm of Hg
Note: Raoult’s law is quite similar to the ideal gas law. The only exception of Raoult’s law is that it applies to solutions too. The ideal gas law assumes the ideal behavior of gases in which the intermolecular forces that are present between dissimilar molecules is zero or non-existent. Whereas, Raoult’s law assumes that the intermolecular forces that exist between different molecules and similar molecules are equal.
Raoult’s law can be applied to non-ideal solutions too. However, this is done by incorporating several factors where we have to consider the interactions between molecules of different substances. An ideal solution is defined as one which obeys Raoult's Law.
Vapour pressure
Complete step by step answer:
We know,
Mole fraction of solvent =
To find the number of moles of urea (solute) and water (solvent):
Number of moles =
Given the mass of urea
Molar mass of urea
Moles of urea(
Given mass of water
Molar mass of water
Moles of water(
Now, to find the vapour pressure of solution we apply the formula:
Substituting values in the formula:
Now,
Vapour pressure of solution
Note: Raoult’s law is quite similar to the ideal gas law. The only exception of Raoult’s law is that it applies to solutions too. The ideal gas law assumes the ideal behavior of gases in which the intermolecular forces that are present between dissimilar molecules is zero or non-existent. Whereas, Raoult’s law assumes that the intermolecular forces that exist between different molecules and similar molecules are equal.
Raoult’s law can be applied to non-ideal solutions too. However, this is done by incorporating several factors where we have to consider the interactions between molecules of different substances. An ideal solution is defined as one which obeys Raoult's Law.
Recently Updated Pages
Physics and Measurement Mock Test 2025 – Practice Questions & Answers

10 Best Commerce Colleges in India

Benefits of Participating in SOF Olympiad 2023-24

Personalized Tuition for IGCSE Biology: Proven Results for 2025

1-on-1 Online Tuition for IELTS, SAT & International Tests 2025

Low Rank in JEE Main 2020? Try in These Engineering Colleges

Trending doubts
When was the first election held in India a 194748 class 12 sst CBSE

Which are the Top 10 Largest Countries of the World?

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Name the Union territory having the highest density class 12 biology CBSE

Why is the cell called the structural and functional class 12 biology CBSE

KnockKnee syndrome results due to pollution of A Heavy class 12 biology CBSE
