The normal boiling point of pure benzene is found to be 80.10C. What is the approximate molecular weight of a nonionizing substance if a solution of 3.55 g of the substance dissolved in 100. g of benzene has a normal boiling point of for benzene, C6H6.

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muhorosamuel40Lv4

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Pure benzene, C₆H₆, has a molar mass of 78.114 g/mol, a density of 0.8765 g/ml, a freezing point of 5.45^°C, and a boiling point of 80.2^°C. Its freezing point depression and boiling point elevation constants are: K_f = 5.07^°C/; K_b = 2.53^oC/m. A solution was made by taking 33.88 g of an unknown nonelectrolyte and dissolving it in 175.0 g of benzene. The measured freezing point of the solution was 1.65^oC. Calculate the molar mass of the unknown substance.

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Biphenyl, C₁₂H₁₀, is a nonvolatile, nonionizing solute that is soluble in benzene, C₆H₆. At 25°C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 10.1 g of biphenyl in 28.5 g of benzene?