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The vapour pressure of pure benzene at a...

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5g when added to 39g of benzene (molar mass 78g `mol^(-1)`), vapour pressure becomes 0.845 bar. What is the molar mass of the solid substance ?

A

`340 g mol^(-1)`

B

`170 g mol^(-1)`

C

`240 g mol^(-1)`

D

`270 g mol^(-1)`

Text Solution

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The correct Answer is:
A
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