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CH12 worksheet


									CHEM162                                                                                     CH12 worksheet

1) An aqueous solution of hydrochloric acid is 11.8 M and has a density of 1.190 g/mL. Calculate its:
        (a) mass percent
        (b) molality
        (c) mole fraction
        Hint: for these problems, assume 1L solution

2) Calculate the vapor pressure lowering of a solution of 2.00 g aspirin (C9H8O4, i=1) in 50.0 g methanol
(CH3OH) at 21.2°C. Pure methanol has a vapor pressure of 101 torr at this temperature
CHEM162                                                                                     CH12 worksheet

3) What is the boiling point of the solution when you add 1.00 kg of ethylene glycol (C2H6O2, i=1) to 4450 g
of water (Kb.p.= 0.512°C/m, b.p. = 100.00°C) in your car radiator?

4) What is the minimum concentration (molality) of an aqueous ethylene glycol (K f.p.= 1.86°C/m, i = 1)
solution that will protect a car’s cooling system from freezing at -18.0°C?

         Would you need a more or less concentrated solution of ethylene glycol if acetic acid
         (Kf.p.= 3.90°C/m, i = 1) were used as the solvent?

5) What is the osmotic pressure of blood if a 0.30 M aqueous solution of sucrose (C12H22O11, i=1) that is at
37˚C has approximately the same osmotic pressure?

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