Molal boiling-point-elevation constant (Kb) for pure water is 0.51°C/ m. A dilute solution of a nonvolatile solute (does not dissociate) in water was found to boil at 105.1 °C. The concentration of the nonvolatile solute in the solution is - m.

8.71ml of a 4.00M HIO3(aq) solution is added to an ice-water mixture, and the freezing points were collected before and after addition of HIO3(aq). Once the temperature was stable after addition, the ice was separated from the solution and the mass of the beaker with solution was measured. The data below was recorded. Calculate the van't Hoff factor for HIO3. The freezing point depression constant for water is 1.86°C/m. Mass of beaker (g)l|Mass of beaker + solution (g T°f (°C)||Tf (°C) 87.438 176.179 0.305 ||-0.796

The normal boiling point of a certain liquid X is 121.00 °C, but when 0.12 kg of benzamide (C,H,NO) are dissolved in 800. g of X the solution boils at 122.9 °C instead. Use this information to calculate the molal boiling point elevation constant K, of X. Be sure your answer is rounded to the correct number of significiant digits. °C· kg x10 K, = || mol

When 4.59 g of a certain molecular compound X are dissolved in 35. g of dibenzyl ether ((C%H,CH,),°). the freezing point of the solution is measured to be 0.9 °C. Calculate the molar mass of X. If you need any additional information on dibenzyl ether, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 1 significant digit. 0 00 0.0 X x10

When 1.38 g of a certain molecular compound X are dissolved in 90.0 g of cyclohexane (C,H,,), the freezing point of the solution is measured to be 6.3 °C. Calculate the molar mass of X. If you need any additional information on cyclohexane, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. x10

The molal boiling point elevation constant K = 1.15 °C-kg-mol for a certain substance X. When 14.4 g of urea the solution boils at 145.4 °C. Calculate the boiling point of pure X. Be sure your answer has the correct number of significant digits. °C X a ((NH,), CO) S are dissolved in 150. g of X,

The organic compounds chloroform and dichloromethane form ideal solutions when mixed together; at 25 �C the total vapor pressure from a mixture of these two compounds was 345.322 torr. What is the mole fraction of chloroform? Given that the vapor pressure of pure chloroform and pure dichloromethane are 205 torr and 415 torr, respectively, at 25�C.  0.6682    0.4430  0.3318  0.5570