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The vapour pressure of acetone at 20^@C ...

The vapour pressure of acetone at `20^@C` is 185 torr. When 1.2 g of a non-volattile substance was dissolved in 100 g of acetone at `20^@C`, it molar vapour pressure was 183 torr. The molar mass `(gmol^-1)` of the substnace is

A

128

B

488

C

32

D

64

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