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(A) The molar mass of urea $(NH_2CONH_2)$ is $60 \ g/mol$. Assuming the density of the solution is $1 \ g/mL$,a $6 \%$ solution means $6 \ g$ of urea

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$1 \ M$ solution of glucose

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(A) The molar mass of urea $(NH_2CONH_2)$ is $60 \ g/mol$. Assuming the density of the solution is $1 \ g/mL$,a $6 \%$ solution means $6 \ g$ of urea in $100 \ mL$ of solution. Molarity of urea $= \frac{	ext{mass of solute}}{	ext{molar mass} 	imes 	ext{volume of solution in L}} = \frac{6 \ g}{60 \ g/mol 	imes 0.1 \ L} = 1 \ M$. Two solutions are isotonic if they have the same molar concentration. Therefore,a $6 \%$ urea solution is isotonic with a $1 \ M$ solution of glucose.

$A$ $6 \%$ solution of urea is isotonic with

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