A 5% solution of cane sugar (molar mass ...

A 5% solution of cane sugar (molar mass = 342) is isotonic with 1% solution os a substance X. The molar mass of X is:

A

171.2

B

68.4

C

34.2

D

136.2

Verified by Experts

The correct Answer is:

b

`pi=(W_(B)xxRxxT)/(M_(B)xxV)`
R, T and V are constants for isotonic solutions
`pi_(x)=pi_(sugar)1/M_(x)=5/342`
`or M_(X)=342/5=68.4`

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