Question

the freezing point of a solution containing 4.8 g of a compound in 60 g of benzene is 4.48 .what is the molar mass of the compound ​

Answer 1

The freezing depression of a solvent is dependent on the amount of solute in solution and the amount of solvent. You also need to know the freezing point of the pure solvent and its freezing point depression constant. These can be found in tables from a variety of sources. I used Wikipedia. The freezing point of pure benzene is 5.5 deg C and its freezing point depression constant is -5.12 deg C/m where m is the molality of the solution (defined as the number of moles of solute divided by the kilograms of solvent).