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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-volatile solute was dissolved in 100 g of acetone at `20^@C` its vapour pressure was 183 torr. The mass `(g mol^(-1))` of the substance is.

A

64

B

128

C

488

D

32

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A
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