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A5% solution of cane sugar (molar mass =...

A`5%` solution of cane sugar (molar mass =`342`)is isotonic with `1%`of a solution of an known solute.The molar mass of unknown solute in g/mol is

A

`136.2`

B

`171.2`

C

`68.4`

D

`34.2`

Text Solution

Verified by Experts

The correct Answer is:
C
`P_(c.s) = P_(Unk)`
`((n)/(V))_(c.s) RT = ((n)/(V))_(unk) RT`
`(5 xx 10)/(342) = (1xx10)/(M)`
`M = 68.4 gm//mol`
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