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The vapour pressure of acetone at 20^(@)...

The vapour pressure of acetone at `20^(@)C` is 185 torr. When `1.2 g` of non-volatile substance was dissolved in `100g` of acetone at `20^(@)C` its vapour pressure was 183 torr. The molar mass `(g mol^(-1))` of the substance is:

A

32

B

54

C

128

D

488

Text Solution

Verified by Experts

`(1.2/M)/(100/58)=2/183impliesM=(1.2xx8.3xx58)/(100xx2)=63.684~~=64`
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