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Question

The osmotic pressure of a solution of an organic substance containing 18 g in one litre of solution at 293 K is 2.414×105 Nm2. Find the molecular mass of the substance if S=8.3 JK1 per mol

A
181.33
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B
173.33
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C
160.33
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D
152.33
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Solution

The correct option is A 181.33
Applying the equation,

PV=wmRTor m=wPVRTGiven, P=2.414 Nm2, V=1.0 lit=1×103m3,R=8.3 JK1 per mol, w=18 g and T=293 K
m=182.414×105×1×103×8.3×293=181.33 g

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