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Q.

At 301 K the vapour pressure of pure water is 3.780 kPa. When a certain weight of solute of molar mass 342 is dissolved in 1000 gms of water, the vapour pressure is lowered ta 3.776 kPa. The molality of the solute is

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a

0.263

b

0.315

c

0.354

d

0.206

answer is C.

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Detailed Solution

 Mole fraction of solute =3.78−3.7663.78=0.0037 Moles of water =1−0.0037=0.9963; Weight of water =0.9963×18gm Molality of solute =0.0037×10000.9963×18=0.206.

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