Chemistry - Liquid Solution Question with Solution | TestHub

Since both solutions boil at the same temperature, their boiling point elevations ($\Delta T_b$) are equal.

For dilute solutions, $\Delta T_b=K_b\times C$, where $C$ is the molar concentration. Therefore, the molar concentrations of both solutions must be equal.

$C_{\text{glucose}}=C_A$

$\frac{W_{\text{glucose}}}{M_{\text{glucose}}\times V}=\frac{W_A}{M_A\times V}$

Substituting the given values:

$\frac{18}{180}=\frac{6}{M_A}$

$0.1=\frac{6}{M_A}$

$M_A=\frac{6}{0.1}=60\mathrm{g}{\mathrm{mol}}^{-1}$

Answer: $60\mathrm{g}{\mathrm{mol}}^{-1}$