One litre aqueous solution of sucrose (molar mass = "342 g mol"^(-1)) – InterviewSolution

1.	One litre aqueous solution of sucrose (molar mass = "342 g mol"^(-1)) weighing 1015 g is found to record an osmotic pressure of 4.82 atm at 292 K. What is the molality of the sucrose solution? (R = 0.0821 atm "mol"^(-1)"K"^(-1)).
Answer» Solution :`PI="CRT gives C = 0.2 mol L"^(-2)="0.2 mol in 1015 g solution."` `"Hence, mass of solvent "=1015-(0.2xx342)=946.6g.` `"MOLALITY "=("0.2mol")/("946.6g")xx"1000 g kg"^(-1)=0.2112m.`

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