LR 12 05 and 08 2014 1 Methane has a Henry s Law constant of 9 88 10 2 mol L atm when dissolved in benzene at 25 C How many grams of CH4 will dissolve in 3 00 L of benzene if the partial pressure of CH4 is 1 48 atm 2 Calculate the molarity and the molality of a 15 0 by mass solution of MgCl2 in H2O The density of this solution is 1 127 g mL 3 What is the vapor pressure of a solution at 30 C that contains 398 g of sucrose C12H22O11 in 524 g of water The vapor pressure of water at 30 C is 31 8 mm 4 A solution is made of ethanol and 1 propanol At 35 C the vapor pressure of ethanol is 100mmHg and of 1 propanol is 38mmHg Calculate the partial pressure of each component if the mole fraction of ethanol is 0 300 5 How many grams of ethylene glycol molar mass 62 1 g mol should be added to 6 50 kg of water the amount in a car radiator to lower the freezing point to 22 0 C Kf for water is 1 86 C m 6 How many grams of glycerol C3H5 OH 3 molar mass 92 0 g mol should be added to 100g of water to form a solution that boils at 107 C Kb for water is 0 52 C m 7 What are the boiling and freezing point of a 2 47m solution of naphthalene in benzene The boiling point of benzene is 80 1 C its freezing point is 5 5 C Kb is 2 53 C m and Kf is 5 12 C m 8 Which of the following solutions would have the lowest boiling point Lowest freezing point 1 00 m sugar solution 1 00 m NaCl 2 00 m ethylene glycol 2 00 m MgSO4 An aqueous solution of ascorbic acid vitamin C contains 22 0 g of ascorbic acid in 100g of water This solution freezes at 2 33 C What is the molar mass of ascorbic acid 9 10 Of the substances listed below which should have the lowest vapor pressure The lowest boiling point The lowest freezing point Which two solutions should lower the freezing point of a aqueous solution by the same amount a b 1 50 m urea solution 0 75 m ethylene glycol c d 1 20 m KCl 0 50 m CaSO4
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