Question

For an ideal solution containing a nonvolatile solute, which of the followig expressions represents the vapour pressure of the solution?$(x_1\to molefractionofsolvent)$

• A. $p=x_2{p}_2{}^{\ast }$
• B. $p=x_1{p}_2{}^{\ast }$
• C. $p=x_1{p}_1{}^{\ast }$
• D. $p_1{}^{\ast }-p=x_2$

Answer 1

Answer: (C)

$p=x_1{p}_1{}^{\ast }$

For an ideal solution containing a nonvolatile solute, to find out vapour pressure of the solution the following expression is used: $p=x_1{p}_1^{\ast }$

Vapour pressure of a solution is equal to the product of vapour pressure of pure solvent and mole fraction of solvent.

So the answer is C.