CHEM31PracticeProblems_2Key-1

CHEM31PracticeProblems_2Key-1 - C HM31L Additional Practice...

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CHM31L Additional Practice Problems for Exam #2 I. (Zumdahl 13.31) Lil(s) has a heat of fonnation of -272 kllmol and a lattice energy of -753 kllmo!. The ionization energy of Li(g) is 520. kllmol, the bond energy of rzCg) is 151 kllmol, and the electron affinity of leg) is -295 kllmo!. a. Write the appropriate chemical equation that corresponds to each of these enthalpy changes, specifying the phase of each species involved (e.g. (g), (s), etc). LiCS) +-~ 12.(dJ -~~ L;Its) 6H~-21-Zk.T/tn.r-P L.. i + (d-") + 1- - (d) -I L LL (~) t H = - + s-?> k. T } YVt u-Q G iJ d i -----? L i.. t- (d- I -\- e. 6 1+ =- + 520. kIf ~ 1:: 2. '"d) -------) 2 1: I'll .6 Ii-::: H !,-) k. I } ~ 1 (d H-e- - -------) ]::-lj ) 6/i:: -2'11' U-;)'Y\-,M IV~'. ~k.J- o~ ~V"~~ ~ Y-z~ -'nVtJlv-e :r.(~J Jblf)t - yvv\.U(. ~ '\ Y1 ~ Y l""\ ~ 1:. (sJ ~ I l..lj."1 6\.\.>~,v-,,~ \.NO-/.> "VV=>r (9rbv~bh; 1 ~ ~<\ ~ ~~ ~ ~rp--L\~ L 7.-Uj) ~ tk ~Aj- ~ f ~ y- f'r'6. ~ $~ - b. Use these data in a Born-Haber cycle to detennine the heat of sublimation of Li(s). - 2 17 kJ }yV\~ 1-1(<;)
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