The freezing point depression of a solution of nitrobenzene

Last updated: 7/10/2022

The freezing point depression of a solution of nitrobenzene and a non-ionic (non-electrolyte) unknown was used to determine the molar mass of an unknown. Time-temperature data for the cooling of a solution containing 50.0 g of nitrobenzene and 3.57 g of the unknown is shown in the graph below. The freezing point of pure nitrobenzene is 5.30 °C. The K, of nitrobenzene is 6.87 °C/m.