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The vapour pressure of benzene at 80^...

The vapour pressure of benzene at `80^@C` is lowered by 10 mm by dissolving 2g of a non- volatile substance in 78 g of benzene . The vapour pressure of pure benzene at `80^(@)C ` is 750 mm . The molecular mass of the substance will be _______ ` g mol ^(-1)`?

A

`15`

B

`150`

C

`1500`

D

148

Text Solution

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The correct Answer is:
B
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