At \( 25^{\circ} \mathrm{C} \), at \( 5 \% \) aqueous solution of glucose (molecular weight \( =...

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At \( 25^{\circ} \mathrm{C} \), at \( 5 \% \) aqueous solution of glucose (molecular weight \( =180 \mathrm{~g} \mathrm{~mol}^{-1} \) ) is isotonic with a \( 2 \% \) aqueous solution containing an unknown solute. What is the molecular weight of the unknown solute?
(a) 60
(b) 80
(c) 72
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