Recitation Activity 4 Chemistry 122

Recitation Activity 4 Chemistry 122 - 16 100 g/mol P o =...

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Recitation Activity 4 Chemistry 122, Dr. Loza Week of Jan 28, 2008 Solution Energetics What is the heat of solution (kJ/mol) for a solid with a lattice energy of 225 kJ/mol and a hydration energy of 125 kJ/mol? Factors that Affect Solubility Which molecule in each pair is likely to be more soluble in water? methanol or heptanol dioxane or hexane CH 3 CH 2 OCH 2 CH 3 or CH 3 CH 2 CH 2 CH 3 (Table 13.3) (HW 13.25) Molality What is the molality of a 18.0% by weight of a Pb(NO 3 ) 2 solution if the density is 1.18 g/cm 3 ? Vapor Pressure Lowering Determine the vapor pressure of a solution containing 75.0 g heptane and 25.0 g octane at 100 o C. What is the composition of the vapor in equilibrium with the solution at 100 o C ? C 7 H
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Unformatted text preview: 16 100 g/mol P o = 791 torr C 8 H 18 114 g/mol P o = 352 torr Boiling Point Elevation/ Freezing Point Depression/ A solution of 0.640 g of azulene in 100.0 g of benzene boils at 80.23 o C. The boiling point of benzene is 80.10 o C; the K b is 2.53 o C/molal. What is the molecular weight of azulene? Which of the following solutions should have the highest boiling point? 0.02 m KNO 3 , 0.02 m NaCl, 0.012 m Ce(NO 3 ) 4 , 0.012 m ScCl 3 ,0.012 m or (NH 4 ) 2 SO. Pepsin is an enzyme present in the digestive tract. A solution of 0.500 g of pepsin in 30.0 mL of benzene has an osmotic pressure of 8.92 torr at 27 o C. What is the molecular weight of pepsin?...
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