Question

What is the amount of urea dissolved per litre, if aqueous solution is isotonic with 10% cane suger soution (mol. wt. of urea = 60)?
A. 200 g/L
B. `19.2g//L`
C. `17.54g//L`
D. `16.7g//L`

Answer 1

Correct Answer - C
Isotonic solutions have same osmotic pressure .
`(w_(1))/("Molecular weight"xxV_(1))=(w_(2))/("Molecular weight"xxV_(2))`
`:.(w_(1))/(60xx1)=(10)/(342xx0.1)`
`:.w_(1)=(60xx10)/(342xx01)`
`=175.54g//L`