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Question

The vapour pressure of benzene at a certain temperature is 40 mm of Hg. A non-vapour and non-electrolyte solid weighting 2.175 g added to 39 g of benzene. The vapour pressure of the solution is 600 mm of Hg. What is the molecular mass of solid substance?

A
65.25
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B
59.6
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C
59
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D
79.8
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Solution

The correct option is B 65.25
vapour pressure of pure benzene at certain ttemperature be PA0=640mmHg

Let number of mole of electrolute = n

Number of mole of benzene = 3978=0.5

Mole fraction of benzene = xA=0.50.5+n

p=pA.xA

600=6400.50.5+n

30+60n=32

60n=2

n=260

2.175M=260

M=2.175×602=65.25g

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