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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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