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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

128

B

488

C

32

D

64

Text Solution

Verified by Experts

The correct Answer is:
D
According to Raoult's law
`(P_(0)-P_(s))/(P_(s)) =(n)/(N) rArr (2)/(183) = (((1.2)/(M)))/(((100)/(58)))`
`rArr M = 64`
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