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Q.

The vapour pressure of pure benzene, C6H6 at 50∘C is 268 Torr. How many moles of non-volatile solute per mol of benzene is required to prepare a solution of benzene having a vapour pressure of 167 Torr at 50° C?

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a

0.605

b

0.623

c

0.395

d

0.377

answer is B.

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Detailed Solution

268−167167=n1⇒n=0.605

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