# Calculate the freezing point and boiling point of a solution of 383 g of glucose dissolved in 400. g of water. Determine the boiling point of a…

1. Calculate the freezing point and boiling point of a solution of 383 gof glucose dissolved in 400. g of water.2. Determine the boiling point of a solution of 72.4 g of glycerol dissolvedin 122.5 g of water.3. What is the boiling point of a solution of 30.20 g of ethylene glycol,HOCH2CH2OH, in 88.40 g of phenol?4. What mass of ethanol, CH3CH2OH, should be dissolved in 450. g ofwater to obtain a freezing point of 4.5°C?5. Calculate the molar mass of a nonelectrolyte that lowers the freezingpoint of 25.00 g of water to 3.9°C when 4.27 g of the substanceis dissolved in the water.6. What is the freezing point of a solution of 1.17 g of 1-naphthol,C10H8O, dissolved in 2.00 mL of benzene at 20°C? The density ofbenzene at 20°C is 0.876 g/mL. Kf for benzene is 5.12°C/m, andbenzene’s normal freezing point is 5.53°C.7. The boiling point of a solution containing 10.44 g of an unknownnonelectrolyte in 50.00 g of acetic acid is 159.2°C. What is the molarmass of the solute?8. A 0.0355 g sample of an unknown molecular compound is dissolvedin 1.000 g of liquid camphor at 200.0°C. Upon cooling, the camphorfreezes at 157.7°C. Calculate the molar mass of the unknowncompound.9. Determine the boiling point of a solution of 22.5 g of fructose,C6H12O6 , in 294 g of phenol.10. Ethylene glycol, HOCH2CH2OH, is effective as an antifreeze, but italso raises the boiling temperature of automobile coolant, whichhelps prevent loss of coolant when the weather is hot.a. What is the freezing point of a 50.0% solution of ethylene glycolin water?b. What is the boiling point of the same 50.0% solution?11. The value of Kf for cyclohexane is 20.0°C/m, and its normalfreezing point is 6.6°C. A mass of 1.604 g of a waxy solid dissolvedin 10.000 g of cyclohexane results in a freezing point of 4.4°C.Calculate the molar mass of the solid.12. What is the expected freezing point of an aqueous solution of2.62 kg of nitric acid, HNO3 , in a solution with a total mass of5.91 kg? Assume that the nitric acid is completely ionized.13. An unknown organic compound is mixed with 0.5190 g of naphthalenecrystals to give a mixture having a total mass of 0.5959 g. Themixture is heated until the naphthalene melts and the unknown substancedissolves. Upon cooling, the solution freezes at a temperatureof 74.8°C. What is the molar mass of the unknown compound?14. What is the boiling point of a solution of 8.69 g of the electrolytesodium acetate, NaCH3COO, dissolved in 15.00 g of water?15. What is the expected freezing point of a solution of 110.5 g ofH2SO4 in 225 g of water? Assume sulfuric acid completely dissociatesin water.16. A compound called pyrene has the empirical formula C8H5 . When4.04 g of pyrene is dissolved in 10.00 g of benzene, the boilingpoint of the solution is 85.1°C. Calculate the molar mass of pyreneand determine its molecular formula. The molal boiling-point constantfor benzene is 2.53°C/m. Its normal boiling point is 80.1°C.17. What mass of CaCl2 , when dissolved in 100.00 g of water, gives anexpected freezing point of 5.0°C; CaCl2 is ionic? What mass ofglucose would give the same result?18. A compound has the empirical formula CH2O. When 0.0866 g isdissolved in 1.000 g of ether, the solution’s boiling point is 36.5°C.Determine the molecular formula of this substance.19. What is the freezing point of a 28.6% (by mass) aqueous solution ofHCl? Assume the HCl is 100% ionized.20. What mass of ethylene glycol, HOCH2CH2OH, must be dissolved in4.510 kg of water to result in a freezing point of 18.0°C? What isthe boiling point of the same solution?21. A water solution containing 2.00 g of an unknown molecular substancedissolved in 10.00 g of water has a freezing point of 4.0°C.a. Calculate the molality of the solution.b. When 2.00 g of the substance is dissolved in acetone instead ofin water, the boiling point of the solution is 58.9°C. The normalboiling point of acetone is 56.00°C, and its Kb is 1.71°C/m. Calculatethe molality of the solution from this data.22. A chemist wants to prepare a solution with a freezing point of22.0°C and has 100.00 g of glycerol on hand. What mass of watershould the chemist mix with the glycerol?23. An unknown carbohydrate compound has the empirical formulaCH2O. A solution consisting of 0.515 g of the carbohydrate dissolvedin 1.717 g of acetic acid freezes at 8.8°C. What is the molarmass of the carbohydrate? What is its molecular formula?24. An unknown organic compound has the empirical formula C2H2O.A solution of 3.775 g of the unknown compound dissolved in12.00 g of water is cooled until it freezes at a temperature of4.72°C. Determine the molar mass and the molecular formula ofthe compound.