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Question

The vapour pressure of water at 293 k is 2438 Pa and the vapour pressure of an aqueous solution is 2395.8 Pa. If solution density is 1080 kg/m3 at 313 K. Calculate the osmotic pressure at 313 K. The molecular weight of solute =60.

A
24.54 Pa
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B
24.54×105Pa
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C
0.955 Pa
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D
None of these
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Solution

The correct option is C 24.54×105Pa

PoPsPs=n×18W

nW=(24382395.8)2438×18=9.616×104

Concentration, C=nW×d=9.616×104×1080=1.038

Osmotic Pressure =CRT

Osmotic Pressure =1.038×0.0821×313

Osmotic Pressure =24.54 atm

Osmotic Pressur =24.54×105 Pa


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