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(A) Two solutions are isotonic if they have the same osmotic pressure,which implies they have the same molar concentration $(C)$.For urea $(NH_2CONH_2

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$0.1 \, M$ glucose solution

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(A) Two solutions are isotonic if they have the same osmotic pressure,which implies they have the same molar concentration $(C)$.For urea $(NH_2CONH_2)$,the molar mass is $60 \, g/mol$.$A$ $0.6 \%$ solution means $0.6 \, g$ of urea in $100 \, mL$ of solution,which is $6 \, g/L$.Molarity $(C)$ of urea = $\frac{6 \, g/L}{60 \, g/mol} = 0.1 \, M$.Since glucose is a non-electrolyte,a $0.1 \, M$ glucose solution will have the same molar concentration $(0.1 \, M)$ and thus the same osmotic pressure as a $0.1 \, M$ urea solution.

$A$ $0.6 \%$ solution of urea is isotonic with which of the following?

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