Question

According to Raoult’s law, for a pure component solution the partial pressure is equals to

(a) Total pressure

(b) Vapour pressure

(c) Atmospheric pressure

(d) Mole fraction of respective phase

This question was posed to me in examination.

I would like to ask this question from Gas-Absorption Principle in section Gas Absorption of Mass Transfer

Answer 1

The correct answer is (b) Vapour pressure

Easiest explanation: Generally, Raoult’s law states that equilibrium partial pressure of a component at certain conditions equals the product of the mole fraction and the vapour pressure. For a pure component (i.e.)   mole fraction equals one.

Therefore, the partial pressure equals vapour pressure.