A $5 \%$ solution of glucose is isotonic with a $2.5 \%$ solution of a substance X at 298 K . Molar

Question

A $5 \%$ solution of glucose is isotonic with a $2.5 \%$ solution of a substance X at 298 K . Molar mass of $X$ is

Professor PC Thomas Classes · Answer

Molarity of glucose solution $=$ Molarity of solution of $X$. $\frac{5 	imes 1000}{180 	imes 100}=\frac{2.5 	imes 1000}{M_{2} 	imes 100}$ $M_{2}=\frac{2.5 	imes 180}{50}=90 g mol^{-1}$