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The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

$\begin{array}{1 1}12.08kPa\\10.08kPa\\15.08kPa\\11.08kPa\end{array}$

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1 molal solution means 1 mol of the solute in 1kg of the solvent(water)
Mole fraction of solute =$\large\frac{1}{1+55.5}$
$\Rightarrow 0.0177$
Now,$\large\frac{P_0-P_s}{P_0}=$$x_2 (ie) \large\frac{12.3-P_s}{12.3}$$=0.0177$
$P_s=12.08kP_a$
answered Aug 5, 2014

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