Ncert Exercises & Solutions

The unit that relates concentration of solution with its vapour pressure is:
1. Mole fraction.
2. Parts per million.
3. Mass percentage.
4. Molality.

HINT: Henry's law

Explanation:

According to Henry's law partial pressure of gas in the solution is proportional to the mole fraction of gas in the solution.

p = K_H x

where, K_H =Henry’s constant

Hence, (1) mole fraction is the correct choice.