1.

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

Answer»

Solution : 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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