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A 4% solution of sucrose is isotonic wit...

A 4% solution of sucrose is isotonic with 3% solution of an unknown organic substance. Calculate the molecular mass of unknown substance.

Text Solution

Verified by Experts

As the solutions are isotonic, the molarities of the two solutions are equal.
`M_("sucrose") = M_("unknown")`
`4/342 xx 1000/100 = 3/x xx 1000/100`
` x = (3 xx 342)/(4) = (3 xx 171)/(2) = 513/2 = 256.5 g "mol"^(-1)`
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