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Question
State Raoult's law for the solution containing volatile components. What is the similarity between Raoult's law and Henry's law?
Solution
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 (1 and 2), then for component 1:
p1 ∝ x1
\[p_1 = p_1^o x_1 \]
For component 2:
\[p_2 = p_2^o x_2 \]
Here:
p1, p2 = Partial vapour pressure of two volatile components (1 and 2) of the solution
x1 , x2 = Mole fractions of the components (1 and 2)
Similarity between Raoult's law and Henry's law:
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