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  4. Mole fraction of a solute in an aqueous solution is 0.2. The molality of the solution will be

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Q. Mole fraction of a solute in an aqueous solution is $0.2$. The molality of the solution will be

Some Basic Concepts of Chemistry

Solution:

$\chi_B=0.2, \chi_A=0.1$
$m=\frac{\chi_B \times 1000}{\chi_A \times M w_A}=\frac{0.2 \times 1000}{0.8 \times 18}=13.88$