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Question

A compound H2X with molar weight of 80 g is dissolved in a solvent having density of 0.4 g/mol, Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is .

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Solution

Accordingtoquestion...............let,In3.2molarsolution,Wehaveamountofsolute=3.2molVolumeofsolution=1.0LSincethereoccursnochangeinvolumeondissolvingsolute,Volumeofsolvent=1LMassofsolvent=(1.0L)(0.4gmL1)=(103mL)(0.4gmL1)=400g=0.4kgMolalityofthesolution=3.2/0.4a=8molkg1Sothatthesolutionis8molkg1.

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