alleryHenry's law for the dissolution of a gas in a liquid is most commonly expressed as:
Ap = KH / x
Bp = KH x
Cp = KH + x
Dx = KH p
Answer & Solution
Correct answer: B. p = KH x
1. Henry's law states the partial pressure of a gas in the vapour phase is proportional to its mole fraction in solution.
2. Written with the Henry's law constant KH, this gives $p = K_H x$.
3. The pressure is directly (not inversely) proportional to mole fraction, so the divided form is wrong.
_Source: syllabus Chemistry Ch 1 "Solutions", p.6_
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