What is the osmotic pressure at STP of a solution made from $1 L$ of $N a C l$ (aq) containing $117 g$ of $N a C l$ ?

44.77 a t m

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48.87 a t m

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89.54 a t m

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117 a t m

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Solution

The correct option is D $89.54 a t m$
$Π = M R T$
$Π = (117 / 58.5) 0.082 \times 273$
$Π = 44.77 a t m$
Van't Hoff factor, $i = 2$ ,
$N a C l$ dissociates into $2$ ions,
Actual osmotic pressure , $i Π = i M R T$
$i Π = 2 \times 44.77 = 89.54 a t m$

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