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Q.

At 20°C, the vapour pressure of diethyl ether is 442mm. When 6.4g. of a non-volatile solute is dissolved in 50g. of ether, the vapour pressure falls to 410mm. The Molecular weight of the solute is

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a

150

b

180

c

160

d

130.832

answer is B.

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Detailed Solution

Po-P=442-410=32 Ws=6.4g, Wo=50g, Ms=? Po-PPo=WsMs×MoWo 32442=6.4Ms×7450 Ms=6.4×442×7432×50=130.832g

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