List of top Chemistry Questions on Colligative Properties and Determination of Molar Mass asked in CBSE Class XII

Calculate the vapour pressure of a solution containing \( 61 \, g \) of benzoic acid (molar mass \( = 122 \, g \, mol^{-1} \)) dissolved in \( 500 \, g \) of benzene when the vapour pressure of pure benzene at this temperature of experiment is \( 66 \, torr \). Assume complete dimerization of benzoic acid in benzene.
A solution containing \( 8.0 \text{ g} \) of a non-volatile solute in \( 100 \text{ g} \) of diethyl ether boils at \( 36.86 ^\circ\text{C} \) whereas pure diethyl ether boils at \( 35.60 ^\circ\text{C} \). Determine the molar mass of the solute. (\( K_b \) for diethyl ether = \( 2.02 \text{ K kg mol}^{-1} \))