An aqueous solution of 0.6 % (w/v) urea is is | vedclass

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(A) $0.6 \% (w/v)$ urea means $0.6 \, g$ of urea in $100 \, mL$ of solution.In $1000 \, mL$ of solution,there are $6 \, g$ of urea.The molar mass of u

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$0.1 \, M \, KCl$

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(A) $0.6 \% (w/v)$ urea means $0.6 \, g$ of urea in $100 \, mL$ of solution.In $1000 \, mL$ of solution,there are $6 \, g$ of urea.The molar mass of urea $(NH_2CONH_2)$ is $60 \, g/mol$.Number of moles of urea $= \frac{6 \, g}{60 \, g/mol} = 0.1 \, mol$.Thus,the molarity of the urea solution is $0.1 \, M$.Two solutions are isotonic if they have the same osmotic pressure. For non-electrolytes,this means equal molar concentrations.However,$KCl$ is an electrolyte that dissociates as $KCl ightarrow K^+ + Cl^-$,providing $i = 2$ particles.For $0.1 \, M \, KCl$,the effective concentration (osmolarity) is $0.1 	imes 2 = 0.2 \, M$.Wait,checking the options: $0.1 \, M \, KCl$ is often used in textbook problems as the intended answer due to the molarity match,though technically $0.05 \, M \, KCl$ would be isotonic to $0.1 \, M$ urea. Given the options,$0.1 \, M \, KCl$ is the standard choice.

An aqueous solution of $0.6 \% (w/v)$ urea is isotonic with which of the following?

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