1)A solution of H2SO4(aq) with a molal concentration of 2.24 ???? has a density of 1.135 g/mL. What is the molar concentration of this solution? 2. A solution is made by mixing equal masses of methanol, CH4O, and ethanol, C2H6O. Determine the mole fraction of each component to at least three significant figures. 3. A solution of CaCl2 in water forms a mixture that is 32.5% calcium chloride by mass. If the total mass of the mixture is 271.8 g, what masses of CaCl2 and water were used? 4. What is the mole fraction of solute in a 3.82 ???? aqueous solution? 5. What is the mole fraction, ????, of solute and the molality, ???? (or ????), for an aqueous solution that is 17.0% NaOH by mass? 6. Menthol is a crystalline substance with a peppermint taste and odor. When 1.16 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.20 ?C. Look up the freezing point and ????f constant for cyclohexane in the Colligative Constants table. Calculate the molar mass of menthol. 7. 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 14.2 g of biphenyl in 34.1 g of benzene? 8. Assuming 100% dissociation, calculate the freezing point ( ????f ) and boiling point ( ????b ) of 1.48 ???? K3PO4(aq) Colligative constants can be found in the chempendix. 9. If a 0.550 ???? aqueous solution freezes at −3.20 ?C, what is the van't Hoff factor, ????, of the solute? Consult the table of ???? f values.

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