On dissolving \( 0.5 \mathrm{~g} \) of a non-volatile non-ionic solute to \( 39 \mathrm{~g} \) o...

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On dissolving \( 0.5 \mathrm{~g} \) of a non-volatile non-ionic solute to \( 39 \mathrm{~g} \) of benzene, its vapor pressure decreases from
P \( 650 \mathrm{~mm} \mathrm{Hg} \) to \( 640 \mathrm{~mm} \mathrm{Hg} \). The depression of freezing

W point of benzene (in \( \mathrm{K} \) ) upon addition of the solute is
(Given data : Molar mass and the molal freezing point depression constant of benzene are \( 78 \mathrm{~g} \mathrm{~mol}^{-1} \) and \( 5.12 \)
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