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Unformatted text preview: at 20 o C; the vapor pressure of pure water is 17.00 mm Hg at this temperature. Apply Henrys and Raoults laws to calculate the two partial pressures and the total vapor pressur of a 5 mole % solution. 4. A solution of sucrose in water freezes at -0.200 o C. Calculate the vapor pressure of this solution at 25 o C (accurate to 0.001 mm Hg). The vapor pressure of pure water at 25 o C is 23.506 mm Hg and the molal freezing-point constant for water is 1.86 o C/m. 5. The osmotic pressure of solutions of polystyrene in toluene were measured at 25 C and the pressure was expressed in terms of the height of the solvent of density 1.004 g/cm 3 . c/(gL-1 )2.042 6.613 9.521 12.602 h/cm 0.592 1.910 2.750 3.600 Calculate the molar mass of the polymer. 6. 9.17...
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