Ans to Recitation Activity 4 Chemistry 122 to post

Ans to Recitation Activity 4 Chemistry 122 to post - 2 CH 3...

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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? A(separated) + B(separated) 125 kJ/mol ENERGY __________ solution 225 kJ/mol H soln 100 kJ/mol A + B __________________ Factors that Affect Solubility Which molecule in each pair is likely to be more soluble in water? methanol or heptanol dioxane or hexane (Table 13.3) (HW 13.25) CH 3 CH 2 OCH
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Unformatted text preview: 2 CH 3 or CH 3 CH 2 CH 2 CH 3 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 ? m, molality = mol(Pb(NO 3 ) 2 ) kg(H 2 O) mole solute = 18.0 g Pb(NO 3 ) 2 x 1 mol Pb(NO 3 ) 2 = 0.0543 mol Pb(NO 3 ) 2 331.2 g Pb(NO 3 ) 2 g solution = g ethylene glycol + g water 100.0 g total- 18.0 g Pb(NO 3 ) 2 82.0 g water = 0.0820 kg water = 0.0820 kg solvent m, molality = 0.0543 mole EG = 0.663 m 0.0820 kg water 1...
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