CHEM163B_HW9_solutions_2011

CHEM163B_HW9_solutions_2011 - Winter 2011 Chemistry 163B...

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Winter 2011 Chemistry 163B 1 Homework #9 Problems (#44-#55) 44. [Adapted from Raff #6.1, p282] At 298K mol and S J mol Al( ) 01 0 1 7.2 39.55 f kJ for ! " " # # ± . Using the data for Al(s) in Appendix A, calculate the melting temperature of Al(s) at P=1 bar. Assume that the difference in entropies of Al(s) and Al( ± ) is a constant, equal to the value at 298K. Compare your result to the experimental value in Table 2.2 (p 541 E&R). . 45. E&R P8.5 [(b) CO 2 starts at 65 atm in gas phase] 46. E&R P8.14 47. (optional) E&R P8.21 (b part only); BUT “Calculate the vapor pressure of CS 2 ( ± ) at 115.0ºC 100.0ºC assuming …” [the solutions in back of E&R and in the Solutions Manual appear to correspond to 100.0ºC, so let’s use 100.0ºC !!] 48. [Adapted from Raff #6.28, p285] Two crystalline forms, A and B, of a compound are in equilibrium. The density of A is greater than the density of B. The conversion of A to B is exothermic. a. If one wishes to shift the equilibrium towards crystal B, should one raise or lower the temperature? Should one raise or lower the pressure? Explain b. Which is more ordered, A or B? Explain.
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CHEM163B_HW9_solutions_2011 - Winter 2011 Chemistry 163B...

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