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When 25 g of a non-volatile solute is di...

When 25 g of a non-volatile solute is dissolved in 100g of water, the vapour pressure is lowered by `2.25 xx 10^(-1)mm`. If the vapour pressure of water at `20^(@)C` is mm, what is the molecular weight of the solute?

A

206

B

302

C

345

D

276

Text Solution

Verified by Experts

The correct Answer is:
C
`pi = CRT`
`0.0821=C xx 0.0821xx300`
or `C=(1)/(300)=0.033`
or `0.3xx10^(-2)`
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NARAYNA-SOLUTIONS & COLLIGATIVE PROPERTIES -EXERCISE : 3
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  10. Colligative properties

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