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Van't Hoff Factor

An aqueous so...

Question

An aqueous solution at $17^{o} C$ contains $1.75 g$ of sucrose per $150 m l$ of solution. The osmotic pressure of the solution will be:

8.12 a t m

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0.82 a t m

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0.75 a t m

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1.25 a t m

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Solution

The correct option is B $0.82 a t m$
Concentration $C = \frac{1.75 \times 1000}{342 \times 150} = 0.034 M$
$T = 17^{o} C = 290 K$
$∴$ Osmotic pressure $=$ $C R T$
$= 0.034 \times 0.0821 \times 290$
$= 0.82 a t m$

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