Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute?

Question

Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute? (A) 0.8 (B) 0.5 (C) 0.3 (D) 0.2

Tardigrade Admin · Accepted Answer

According to Raoult's law the relative lowering in vapour pressure of an ideal solution containing the non-volatile solute is equal to the mole fraction of the solute.

∵

Relative lowering of vapour pressure

= 0.2

∴

Mole-fraction of the solute

= 0.2

Q. Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute?

0.8

0.5

0.3

0.2

According to Raoult's law the relative lowering in vapour pressure of an ideal solution containing the non-volatile solute is equal to the mole fraction of the solute. ∵ Relative lowering of vapour pressure =0.2 ∴ Mole-fraction of the solute =0.2

Q. Relative lowering of vapour pressure of a dilute solution is $0.2$ . What is the mole fraction of the non-volatile solute?

According to Raoult's law the relative lowering in vapour pressure of an ideal solution containing the non-volatile solute is equal to the mole fraction of the solute.
$∵$ Relative lowering of vapour pressure
$= 0.2$
$∴$ Mole-fraction of the solute $= 0.2$