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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

171.2

B

68.4

C

34.2

D

136.2

Text Solution

Verified by Experts

The correct Answer is:
B
`pi_(1) = pi_(2)`
or `" "C_(1) = C_(2)`
`(5)/(342) = (1)/(M)`
`therefore " " M = (342)/(5) = 68.4`
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