46FinalF08Key0 - CHM 2046 FINAL EXAM FORM A Dec 15, 2008...

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Unformatted text preview: CHM 2046 FINAL EXAM FORM A Dec 15, 2008 Please bubble in A as the test Form Code at the top right of your answer sheet. Failure to do this results in a 10-point penalty. ' 1. If H200) converts spontaneously to H20(g) at 50 °C, it is true that (1) Gr is “—” but AG: is “+" (2) P H20(g) > VP H200) AHr 18 +, ASI 15 —- (4) IAGf| 1120(1) > |AGf| H20(g) < @f the following listed systems at standard-state conditions, spontaneous electron flow occurs most readily for "N « fink) in 1 M NaOH iggfls) in oxygenated 1 M KOH WMS) in 1 M H01 * Z @173 strongest “arr-acceptor“ ligand among the following should be n(s) in 1 M H4NHS in oxygenated 1 M (110)2802 . ._ J I ( . 1 P'— _ - ‘ . (1) C 2 (2) NC %\ SIF4 ( (4) (5) P1ng “"75 e? ER! 4. If, for saturated, aqueous CaCOg 113 IS true that [Ca2+] = $003.21, then it is also true that (1) pH is 8.0 (2) [Ca2+] = 3(Hocog-] @OCOfl : 2(0032-] (4) [0032‘] : 2(HOC02‘] (5) {HOCOQ_] : (“l-12003"). 5. Given that H3N is a “strong field” ligand, the following listed octahedral complex which exhibits the greatest degree of stability based on CFSE (crystal field stabilization energy) is (1) lNliNH3)6l2+ (2) [CoiNHslel2+ (3) [CU(NH3)6l2+ @lptiNHslel4+ (5) [CleH3)6l2+- 6. The strongest “o-donor" ligand among the following should be (1) HgN“ (2) Sng‘ @fiPZ‘ (4) HgP‘ (5) se2-. <F>F he following rxn which is least thermodynamically favored at NLC is M0002_(aq) + 1120(1) —> H30+(aq) + 0032“(aq) (2) “HgCOg(aq)” + Ac‘(aq) —> HAc(aq) + HOCOz"(aq) (3 H4N+(aq) —|— H200) —> H30+(aq) + H3N(aq) " -= 20(1) + F'(aq) —> HF(aq) + HO"(aq) 1120(1) + HOCOg'(aq) —> “HZCO3(aq)” + BIO—(aq). e 1 M HAc/Ac— bufier, when MnO4‘(aq) reacts with HONO(aq) giving Mn(OI-12)62+(aq) and N03? (aq) among the products, the number of moles of NO3_(aC1) produced per mole of HAO consumed is W ><2 (3) 7 flat. 9. Each of the following listed species has the same general shape except (1) XeF42+ (2) ozsenfi- (3) lemon, (4) A50152- (5) KrF5+. @Consider the formation of water from the elements at standard-state cenditions and 100 °C. - For this process each of the following statements is incorrect except 0 1 IAHE’IH20(1) = IAHEIH2O(gJ was > IAH§| )sz Sta > 28m 4 " 0; H300) = AG; H20(g) P H200) > P H20(g). 11. The following CO or CO/NO+ complex which is not stable because it does not correspond to [Kr] NGS stability is (1) [Mn(CO)5]+ é‘mCothWOhfi (3) [Nb(CO)5]‘ (4) [Fe(CO)3(NO)]‘ (5) [Cr(CO)5]0. 4% F04 Riv-10.1 2,044 209 é> he total number of stereoisomers (geometric plus optical) shown by the octahedral complex co ound [C (NH3)3 0H2)BI‘Cl]U is M2 M6 ()(7 9. 13. Consider: H20(l) $3 H20(g), studied at standard conditions and 100 °C. If, for this process, AH? = 40.7 kJ/mol, A5,? is closest to (1) — 316 J/Inol K (2 11209 J/mol K (3) +— 760 J/moi K (4) 163 J/mol K (5) 33.9 J/molK. 6 If 50.0 mL of 0.65 M H4NCl is mixed with 125 mL of 0.26 M NaOH, the [H30+] in the resulting soln Will be cl osest t 8.2 ><10‘g M M3 x 10-6 M 1.4 x 10-11 M )(42’67 x10‘3 M 5 ,7 ts x10-12 M. Eeul @For the trigonal bipyramidal complex [Cr(PF3)3(NO)2]°, if both NO“L ligands occupy equato~ rial coordination positions, the total number of unique bond angles (those which are at least sli tly difierent from each other) is 3 M6 @ ya (5) 7. 16. Based on MOT, the following species with the greatest degree of paramagnetic character is (1) 00+ @0- (3) co- (4) 022+ (5) N02-. 17. If, in aqueous (HO)2502 soln, [HOSOg‘] : [8042’], M, (HO)gSOQ is closest to ) 3.0 x 10“2 M (2) 0.0 x 10-‘1 M (3) 4.0 x 10-4 M (4) 2.0 x 10-3 M 8.0 X 10"3 M . 18. In aqueous (HO)gSOg soln at pH 2.00, HOSOa‘ converts to 8042— to an extent closest to (1) 77% (2) 66% (3) 44% (4)}5% (5) 33%. 19. For CaCO3(s) + “H2003” (aq) + SOB—(aq) + 2 H20(1)# CaSO4‘2H20(s) + 2 HOCOg“(aq) K is closest to (1)1.0x10-2 (2)30 (3) 55 (4) 2.5x102 (5) 0.024. f the following solns, Ca003(s) is most stable in "\ 0.1M NaF (. 0.01 M “H2003” (3) 0.1 M (11,0023011 .. M Na20204 @113 water . ) 21. The following species which cannot have a symmetrical distribution of peripheral atoms with respect to its geometric center is (1) X8032+ (2) 02X8F22_ (3) 86042_ (4) [Co(en)2(OH2)2]3+ eF3+. @010: AgCl(s) + 2 H3N(aq) r—t Ag(NH3)2+(aq + Cl“(aq), K is 0.0029. Thus, on dissolving J mol AgCl in 1. L of 015 Mr aCl, [H3N]i inimu is losest to (1) ,3 M 1.7 M Qfiss M M fits M. 23. A single central-atom species with 3 non-hydrogen perip eral atoms and a total of 28 valence electrons has a general geometry that is (1) tee-shaped (2) trigonal planar (3) trigOnal pyramidal (4) Square planar 5 see-saw shaped. 24. Consider the hydrocarbon molecule, CSHS. For this species the correct number of C-to-C covalent bonds is (1) 0©s (3) 10 (4) 9 (5) 7 or the ydrocarbon molecule, C4H5, the correct number of possible “straight-chain” C-atom structuyfisW _ (1) 5 :43 4 a. r 1.0 L of each of the f owing solns of octahedral complexes, the most favorable change in Sr will be observed oral adding excess en (HgNCHchEWto 0 .10 M [CO(NH3)2(OH2)20]§O/‘ 2 I . 0 1M [Co(en)(OI-12)2Clg]0 .30M [Co(en)2C12]O 0.10 M [00(OH2)5]2+ 0.12 M [CoClg]‘i'. “ €610. ...
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This note was uploaded on 01/26/2009 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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46FinalF08Key0 - CHM 2046 FINAL EXAM FORM A Dec 15, 2008...

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