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CBSE Class 12-science Answered

What is raoults law ?  
Asked by Kusum and Sanjeet | 08 Mar, 2016, 06:28: PM
answered-by-expert Expert Answer

Hi,

Raoult's law states that for a solution of volatile liquids, the partial vapour pressure of each component in the solution is directly proportional to its mole fraction. Thus if there is a solution of two liquid components I and II, then,

for component I,
p 1 ∝ x1 
 
For component II,
 
where
p1 , p2 = Partial vapour pressure of two volatile components I and II of the solution
= Vapour pressure of pure components I and II
x1 , x2 = Mole fractions of the components I and II
According to Dalton's Law of partial pressure:
ptotal  = p1 + p2 
        = p1 °x1 + p 2 °x2 ​
​        = (1-x2)p1 ° + p 2 °x2 ​
ptotal = p1 ° + ( p 2 °-p1 °) x2 ​

Answered by | 08 Mar, 2016, 06:38: PM
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