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) Pure benzene, C6H6, has a density of 0.8765 g/ml, a freezing point of 5.45oC and...

) Pure benzene, C6H6, has a density of 0.8765 g/ml, a freezing point of 5.45oC and a boiling point of 80.2oC. Its freezing point depression constant, Kf, is 5.07oC/m. A solution was made by taking 24.20 grams of an unknown non-electrolyte and dissolving it in 125.0 grams of benzene. The measured freezing point of the solution was -1.65oC. Calculate the molecular weight of the unknown substance.

258 g/mole

145 g/mole

138 g/mole

272 g/mole

595 g/mol

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