‘W’ g of a non-volatile electrolyte solid solute of molar mass ‘M’ g , when dissolved in 100 mL water, decreases vapour pressure of water from 640 mm Hg to 600 mm Hg. [2026]

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Solution

Q.
‘W’ g of a non-volatile electrolyte solid solute of molar mass ‘M’ g ${mol}^{- 1}$ , when dissolved in 100 mL water, decreases vapour pressure of water from 640 mm Hg to 600 mm Hg. If aqueous solution of the electrolyte boils at 375 K and $K_{b}$ for water is 0.52 K kg ${mol}^{- 1}$ , then the mole fraction of the electrolyte solute ( $x_{2}$ ) in the solution can be expressed as:

(Given: density of water = 1 $g / mL$ and boiling point of water = 373 K) [2026]

1 $\frac{16}{2.6} \times \frac{W}{M}$

2 $\frac{1.3}{8} \times \frac{M}{W}$

3 $\frac{2.6}{16} \times \frac{M}{W}$

4 $\frac{1.3}{8} \times \frac{W}{M}$

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