U_633023_2009-05-28 - (Eb /.- l2] /3. -4. 0.010 m Magi “1...

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Unformatted text preview: (Eb /.- l2] /3. -4. 0.010 m Magi “1 to Z .3 we?) I5. . -.~ ~ 'aet, PAGE 1 1—70 gel CHE 1113 TEST l DR. POWELL FEBRUARY 16, 2007 Please print your name on both the test paper and the Scan Tron form. SECTION 1. MULTIPLE CHOICE (8 points each). Ac, 1 A H ’1?! e Which of the following statements is true in reference to the following reaction? H16 —=: 9i C6H6(l) + 15/2 02(9) —+ 6 002(9) + 3 H20(g) AH° = -3135 kJ A87“ / a) Nonspontaneous at all temperatures. b) Spontaneous only at relatively high temperatures. Spontaneous only at relatively low temperatures. Spontaneous at all temperatures. e) Cannot predict without a given value for AS°. Which one of the following do you expect to be moderately soluble both in water and in ( hexane [C5H14(l)]? J a) NH3 b) benzene, C6H6 . NaCI f butyl alcohol, C4H90H ' naphthalene, C10H8 Gil ii) i) if) Which of the following is primarily responsible for the dissolution of acetaldehyde, CH3CHO, in chloroform, Cl-lCI3? (l H W s \ I , H / C ,C . 'Wpeleferses (l f/ , k H / 9) Cl 90 Which of the following solutions should have the lowest free dipole-dipole forces 1! zing point? 0.040 m film’s/e (celeos) t . O 4 0010me500 : 0g 0.020 Alon/r/‘w , s ‘ oozomcoéva '; %Z //\fiw(fié ' Which of the following statements is false? Dispersion (London) forces involve displacement of the electrons of a molecule. @‘3 London forces exist only between nonpolar molecules. c) Dipole-dipole forces are most useful when comparing molecules of similar mass. London forces are most useful when comparing molecules of widely different masses. ikaermanent dipole-dipole forces exist only between polar molecules. PAGE 2 SECTION 2. PROBLEMS (10 points each).\-\ ‘ 6. A 0.10 - g of a polymer is dissolvean 100 mL of toluene. The solution has an osmotic pressure at 20°C. What is the molar mass of the polymer? (R = 0.082 / mol K) a) 2.3 x 103 g/mol b) 2.6 x104g/mol c) 6.8 x 103 g/mol d) 350 g/mol @34 x 103 g/mol @ -» ®~ ' - 7. Given the following table of thermodynamic data, determine the normal iling point ‘ .51); \ TV (in 0C) of bromine. I: K . s Substance Br2(g) Br2(l) 0 AHfO (kJ/mol) 30.71 $0 (J/mol K) 245.3 152.3 79/9 .99; a 29.80C v)“, @720C //" O 0) 130°C d) 159°C 9) 9/ e) 330°C O) 3 \O From the following enthalpies of reaction: chzHgg) + 502(9) '—> 4002(9) + 2H20(l) vl7700 AH°=é2600 kJ>(’/2) ézcsz-(g) + 702(9) —> 4002(9) + 6H20<I) KW AH°=-3120kJ (Ali) §H2<g> +‘/202<g) —> H200) ‘ ~ 97; AH0 {- 286 kJ)( 2) Cf— . ’73lL ., . x ‘i, Egg/g» é, Compute AHO, in kJ, for the reaction : _ \ ’CzH2(9) + 2H2(g)—> Csz(g) /}/7L ka)—234kJ ®x‘/L:CLHL f ElfO/z‘a/Zaea’zfm ‘ b) @w: 2H2 wax/s W c -35.1kJ .\ , , a.» @QKJ (9x l1 « W 4%; Illa/9f T C? W e) -52 kJ .. , ‘ Cl H1 Jr 2 H7, —%@7 i It; 9. The freezing point of chloroform, CHCI3, -63.50°C. The molal freezing point depression constant for chloroform is 4.680C/m. What is the freezing point (0C) of a solution prepared by dissolving 18.0-g of decane (C10H22, a nonelectrolyte) in‘425-g of chloroform? a) 62.1% m Yvu)\ SOWTQ b)'64'1°C :‘ 0' ”bl\lf‘w+ @4900 , ‘ ~ V) g 0'; 1,3338 TF / LWL » 07 lb C : ill? ' a m 2m :44. PAGE 3 ANSWER THE FOLLOWING QUESTIONS ON THE TEST PAPER Please show all your work if you wish to receive any creditll 1. Consider the following reaction: 3CO(g) + Fe203(s) —-) 3002(9) + 2Fe(s) AGO = 455 kJ AH° = —24.8 kJ A30 = 15@ I o What must be the temperature? (10 points) . AG=AH’TA9 '- 2. Rank the following substances in order of increasing vapor pressure at Wriefly explain on the basis of intermolecular forces.(12 points) 7 _ , b<c<p4A , 4a) CH30 3 WM dmsptv gmh MC 5 . * mew/1+, iivmicat 0? all 'WVWWWWC I flpolav 90 Mg Ctlpotc ’Jlmpolc fimé’g— Thu; ave rougher 3b) CH3CCH3 W153i”? flu/'9‘ “J? 10‘” STVDV'QFV Q'l‘tipf’l‘swh “MNS r » " " ' ’ ' M :, Zc) CHscHZCHZOH WM OHM bYlL H Vowd UVU t5 V/MUHC» ,, r041 D ‘ V'i‘ALWMUJ Hr VIJV'C Era»; chsSWYSWVl 859% I d) CH®ICH§§D amt/Wei w-ne-vywlecvmv Wu”; (fr/q»: of [TL-ML:- H ’ “Wits (Graffitiéfisa —0 we: £15114...“le '4 g D l; 031:0 97’1'95- . v ;- we a "'5 . Calculate AG at 25°C for the following reactiori (1 points): ‘ om Eda/4’7 AG = mm .10! ILJ/Wl 6002(9) + 5 H20(9) —* '4CsH1206w + 602(9) VCOZ n _. b l l a SO (J/mol K) a H 475,5 - 214 : 4119 ' bx—24i.b)+(o 39582:! a a _ AH ( ) [Z _Zgwau) T;>’1219+05‘3ll-3 3" “'8 Agrgloxlos)f(2\1)1“EUHC&%.B)+ |”)'2.‘6 + at“ \44’2. “ Z4lb.‘b 2‘ (“‘314 9 ‘ L0H 2- 47 A61 : AH —T/AS: —5 ’(MBX‘fil‘l 93) D : f” 4. Safrole is used/asatopjcal anesthe IC. Calculate the vapor pressure of a solution prepared by dissolvi 0.375 mol " safrole in 750. g of ethanol (CzH5OH) at 25°C? (6 points) P0e am — 50.0’ orr a 5°C ' 1,, . 19335} C? HgDH x MILL- lip/5m) ‘IZVQ -K\ax'24t- 8) * (U (“3'98 ,ms; “Ewan. ‘6 + 45ij 47/79 -- ’5 “.95 _ A9:C(Ux209)+( 219]” [@ng Q>+(V*Z’4)] - [1250 + 212] - EH37,ch 4— IZWJ ( 34,41 f 14LL~8 _A ...
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This note was uploaded on 05/06/2010 for the course CHE 1103 taught by Professor Ermler during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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U_633023_2009-05-28 - (Eb /.- l2] /3. -4. 0.010 m Magi “1...

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