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The vapour pressure of water at 20^(@)C ...

The vapour pressure of water at `20^(@)C is 17.54mm`. When 20g of non - ionic substance is dissolved in 100g of water, the vapour pressure is lowered by `0.30mm`. What is the molecular mass of the substance ?

A

`210.5 gmol ^(-1)`

B

`206.88 g mol ^(-1)`

C

`215.2 g mol ^(-1) `

D

`200.8 g mol ^(-1)`

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The correct Answer is:
A
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