4. (5 pts) When 0.258 g of a molecular compound, benzoic acid, was dissolved in 40.0 g of benzene, the freezing point of the solution was lowered to 5.23 °C. What is the molecular weight of the benzoic acid? Freezing point of pure benzene = 5.46 °Celsius Kf of benzene = 5.12 °C/molal

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