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Solutions

Question
CBSEENCH12005807

State Raoult’s law for solutions where only solvent is volatile. Derive a mathematical exression for this law.

Solution

Answer:

Raoult's law states that for a solution of volatile liquid, the partial vapour pressure of each component in the solution is dirctly proportional to its mole fraction.

Thus if there is solution of two liquid component 1 and 2 then,

for component 1,

p1  x1Andp1 = p10 x1For component 2 ,p2  = p20 x2where p1 p2 = partial vapour pressure of two volatile component in solution1 and 2 of the solution p10 p20 = vapour pressure of pure component 1and 2x1 x2 = mole fraction of component