Question

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C.H. At 25 °C, the vapor pressure of pure benzene is 100.84 Torr. What is the vapor pressure of a solution made from dissolving 16.8 g of biphenyl in 31.3 g of benzene? Psolution Torr

Answer 1

Hi there,

P_sol = χ_solvent * P_solvent , where

P_sol - the vapor pressure of the solution
χ_solvent - the mole fraction of the solvent
P_solvent - the vapor pressure of the pure solvent

moles biphenyl = 16.8 g / 154.2078 g/mol = 0.10894390556 mol

moles benzene = 31.3 g / 78.1118 g/mol = 0.40070770357 mol

χ_solvent = [0.40070770357 mol / (0.40070770357 mol + 0.10894390556 mol)] = 0.78623847426

P_sol = χ_solvent * P_solvent = 0.78623847426 * 100.84 torr = 79.2842877451 ~ 79.3 torr

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C.H. At 25 °C, the vapor pressure of pure benzene is 100.84 Torr. What is the vapor pressure of a solution made from dissolving 16.8 g of biphenyl in 31.3 g of benzene? Psolution = 79.3 Torr

Hope this helped you!

Thank You So Much!

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