SOLVED

41) Arrange the following three water solutions (all 250 cm3 in volume) according to decreasing osmotic pressure at 273 K: 5 g of C2H5OH, 5 g C6H12O6 ,and 5 g C12H22O11. A) C2H5OH > C6H12O6 > C12H22O11 B) C2H5OH > C6H12O6 = C12H22O11 C) C6H12O6 > C2H5OH > C12H22O11 D) C12H22O11 > C6H12O6 > C2H5OH E) C12H22O11 > C2H5OH> C6H12O6 42) Colligative properties are similar in that they all: A) are due to solvent chemical interactions B) depend on the number of solute particles in solution C) depend on the solvent D) have no effect on the properties of solution E) describe colloids 43) Which of the following is a non-colligative property? A) freezing point depression B) boiling point elevation C) osmotic pressure D) solubility E) vapour pressure lowering 44) A solution containing 3.24 g of sulfur in 40 g of benzene boils 0.81°C above the boiling point of pure benzene. Determine the number of S atoms in one molecule of dissolved sulfur. Kb for benzene is 2.53°C m-1. A) 10 B) 12 C) 6 D) 8 E) 4 45) Solutions are made that contain 0.10 moles of each of the following compounds in 100 g of H2O. Choose the compound whose solution will have the highest freezing point. A) K2SO4 B) NaI C) Mg(CH3CO2)2 D) Ca3(PO4)2 E) Sr(NO3)2 46) Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point. A) MgCl2 B) KClO3 C) CO2 D) MgSO4 E) NaBr 47) Which of the following aqueous solutions has the lowest freezing point? A) 1.5 m aluminum perchlorate. B) 1.0 m magnesium phosphate C) 1.5 m calcium nitrate D) 2.0 m potassium chloride 48) Which of the following aqueous solutions has the highest boiling point? A) 1.0 m magnesium phosphate B) 1.5 m sodium sulfate C) 2.0 m lithium perchlorate D) 1.5 m magnesium sulfate 49) We wish to lower the freezing point of the water in an automobile radiator to -40°C. The total mass of water present is 12.0 kg. For which one of the following compounds would we have to use the greatest mass of solute to achieve this? You may assume that Kf for water = -1.86°C/m and that all ionizable solutes are completely ionized with unit activity even at this high concentration. A) AlF3(M.W. = 84 g/mol) B) C2H5OH(M.W. = 46 g/mol) C) CaCl2(M.W. = 111 g/mol) D) C3H6(OH)2(M.W. = 76 g/mol) E) NaCl(M.W. = 58.5 g/mol) 50) Which of the following is a true solution with particles less than 1 nm in size? A) calcium chloride in water. B) oil in water. C) whipped cream. D) milk.