$\begin{array}{1 1}(a)\;0.25\\(b)\;0.75\\(c)\;0.50\\(d)\;0.40\end{array}$

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Answer: 0.5

In solution containing several non-volatile solutes, the lowering of the vapour pressure depends on the sum of the mole fraction of different solutes.

This translates to the equation $\large\frac{p^0-p}{p^0}$$=x_2$, the expression on the left hand side is called the relative lowering of vapour pressure and is equal to the mole fraction of the solute.

$\large\frac{0.80-0.40}{0.80}$$=x_2 = 0.5$

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