A 5.25% soluton of a substance is isoton...

A 5.25% soluton of a substance is isotonic with a 1.5% solution of urea `(molar mass=60gmol^-1)` in the same solvent. If the densities of both the solutons are assumed to be equal to `1.0gcm^-3`, molar mass of the substance will be

`90.0gmol^-1`

`115.0gmol^-1`

`105.0gmol^-1`

`210.0gmol^-1`

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