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Vapour pressure of a solution of 5gof no...

Vapour pressure of a solution of `5g`of non-electrolyte in `100g`water at a particular temperature is`2985N//m^(2)`.The vapour pressure of pure water is`3000N//m^(2)`.The molecular weight of the solute is

A

60

B

120

C

180

D

380

Text Solution

Verified by Experts

The correct Answer is:
C
`(P^@-P_s)/(P^@)=(W_2/M_2)/(W_1/M_1)=(3000-2985)/(3000)=(5/M_2)/(100/18)` or `M_2=180`
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