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Standard XII

Chemistry

Osmotic Pressure

A solution is...

Question

A solution is made of dissolving $20 g$ of a substance in $600 m L$ of water. Its osmotic pressure was found to be $600 m m$ of $H g$ at $15^{o} C$ . Find the molecular weight of the substance.

1198

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500

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1200

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1000

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Solution

The correct option is B $1000$
we have,
760 mm of Hg = 1 atm
therefore, 600 mm of Hg = 0.789 atm
we have,
$π = C R T$

$0.789 = \frac{20}{M \times 600} \times 1000 \times 0.0821 \times 288$

$M = 1000$

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A solution is made of dissolving 20g of a substance in 600mL of water. Its osmotic pressure was found to be 600mm of Hg at 15oC. Find the molecular weight of the substance.

The correct option is B 1000we have,760 mm of Hg = 1 atmtherefore, 600 mm of Hg = 0.789 atmwe have, π=CRT0.789=20M×600×1000×0.0821×288M=1000

A solution is made of dissolving $20 g$ of a substance in $600 m L$ of water. Its osmotic pressure was found to be $600 m m$ of $H g$ at $15^{o} C$ . Find the molecular weight of the substance.

The correct option is B $1000$
we have,
760 mm of Hg = 1 atm
therefore, 600 mm of Hg = 0.789 atm
we have,
$π = C R T$

$0.789 = \frac{20}{M \times 600} \times 1000 \times 0.0821 \times 288$

$M = 1000$