The osmotic pressure of a solution containing $30 g m$ of a substance in $1$ litre solution at $20^{0} C$ is $3.2$ atm. Calculate the value of $S$ in litre atm $K^{- 1} m o l e^{- 1}$ (molecular mass of solute is 228).

2.1

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0.0821

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8.314

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1.987

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Solution

The correct option is B $0.0821$
$Π = M R T$
$3 \cdot 2 = \frac{w}{M \cdot w t} \times \frac{1}{V (l i t)} \times R \times (293)$
$R = \frac{3 \cdot 2 \times 228 \times 1}{30 \times 293}$
$R = 0 \cdot 0830$

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