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CHEM163B_HW10_solutions_2011

CHEM163B_HW10_solutions_2011 - is incorrect 58[Adapted from...

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Winter 2011 Chemistry 163B 1 Homework #10 Problems (#56-#60) 56. [adapted from Raff #8.22] Ten grams of a non-volatile solute are added to 5 moles of a solvent whose total volume is 200 cm 3 . The partial molar enthalpy of fusion of the solvent is 2,000 cal mol -1 , and its normal freezing point is 280 K. The solvent in the solution freezes at 279.894 K. Calculate the osmotic pressure of the solution at 300 K, assuming that the solution is ideal. 57. E&R P9.7 [note: the given solution density (997 kg m -3 ) is IRRELEVANT , not needed, and the answer in the text Appendix, p 584,
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Unformatted text preview: is incorrect] 58. [Adapted from Raff #9.29] The solubility product constant K sp (expressed in molality reference) for BaCl 2 (s) is 176.94 at 298.15 K. The measured solubility of BaCl 2 (s) in water at that temperature is 370.43 g (kg-1 water ). Determine the mean ionic activity coefficient for BaCl 2 at saturation. 59. E&R P11.12 [the text says “ . . for the cell reaction at 50ºC but the solutions on p. 585 are for 62ºC; let’s use 62ºC !!!! ????) 60. E&R P11.16 [the temperature of the cell is 298.15K] FINIS V soln...
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