Raoult's law can be regarded as a special case of Henry's law. This is true when the Henry's law constant KH becomes equal to:
Athe partial pressure of the gas phase
Bthe mole fraction of the gas in solution
Cthe vapour pressure of the pure component
Dthe total vapour pressure of solution
Answer & Solution
Correct answer: C. the vapour pressure of the pure component
1. Henry's law: $p = K_H x$; Raoult's law: $p_i = p_i^0 x_i$.
2. Both make partial pressure proportional to mole fraction; only the proportionality constant differs.
3. Raoult's law is the special case in which $K_H$ equals $p_i^0$, the pure component vapour pressure.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.11_
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