final - _ I W 'l. . Which of the following is primarily...

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Unformatted text preview: _ I W 'l. . Which of the following is primarily responsible for the dissolution of acetaldehyde, CHaCHO, in I chloroform, CHéy’gflJ Z a) London forc s , b) ion-dipole forces ‘ ( §~ C / {/i; . c) dipole-induced dipole forces ' 1 ' d)“ H-bonding- ' f 'i XE?) dipole—dipole forces ‘ 2. Which of the following Substances will have the lowest boiling point? \ a) CHaBr I l 0M 5+ flzcziho; Q/ b) CH3C| 4: Liam m: Ox W i c) CH3F J (25 CH3| is \ CH CH «NW: _. 3‘ 3 3 K L} ' n Cry-1", 3. Which of the following are responsible for the dissolution of NaCl in CHgohé’jgw “a London dispersion forces “\3fkfi \ \3 (RR i00\-,\\ 6 C) , ) Ion-dipole forces dipole-dipole forces d)— dipolesinduced dipole forces e) hydrogen bonding _ fl," 5 fl ‘2 4. Which of the following liquids would make a good solvent for iodine, l2?" ‘ t erg _. , \] frf Hl ,bf H20 0) CH3OH 1d 0014 e) NH3 fl W015 6 a a”; I It»; 9 Which of the following indicates the presence of strong intermolecular forces in a liquid? 60w} 3? 50 \MW t ,2) a low heat of vaporization b) a low critical temperature a low vapor pressure @a low boiling point e) a lowmel r mass in Hydrogen cyanide'-;s produced industgially by the followingexotherrnigf reaction: 'X K i )1 M.“ ray 2NH3(9) + 302(9) + 20449) -> 2HCN(g) + 6H20(g) Q)“ Which of the following statements is true? i ,K E; ' i \ ‘. 1,.- 1} . a) The reaction is spontaneous only at high temperature. D b) The reaction is nonspontaneous at all temperatures. c) The reaction is spontaneous only at low temperatures, @The reaction is spontaneous at all temperatures. ff it is impossible to predict without the AH value. 7. -Which of the following statements is false? @ London forces exist only between nonpolar molecules. 7’ Dipole—dipole forces are most useful when comparing molecules of similar mass. )2; London forces are most useful when comparing molecules of widely different masses. fl)“ Permanent dipole—dipole forces exist only between polar molecules. Dispersion (London) forces involve displacement of the electrons of a molecule. 8. Each of the following substances is a liquid at — 50°C. Place these liquids in order of increasing lépO? pressure. J ‘33 t _ - \u-cJ rt CH3—O—CH3 dimethyletherl : lea-riffs V ‘0» b CH3-—CH2——CH3 propane C, CH3—CHT—OH ethanol l H\ a) ethanol < propane < dimethyl ether ~, ethanol < dimethyl ether < propane /C)/ propane < dimethyl ether < ethanol ' d)“ dimethyl ether < ethanol < propane fifpropane < ethanol < dimethyl ether _. { SECTION 2. PROBLEMS (6 points each). % 9. From the following enthalpies of reaction: C(graphite) + 02(9) afiggzgg) AH°=—393.5 kJ LHZ(g) + %oz(g) —+ mom) 2 AH°= -285.8 kJ ~97: u- CH30H(I) + 3002(9) —> 9039) + 2H20(l)j,} AH°=—726.4 kJ 723.4% Compute AHO, in N, for the reaction ngaphite) + 2mg) + £32m) —+’ septic) a) -1691.5 5 I A —238.7 ’ .1- , 2f.» ‘* f" i; 33 47.1 g / f4} :,:V_ 3 d) '834-1 Car“ ‘ i .2 ' ' " g. e) ET/ 10. The normal boiling point of benzene is 80.10C. The molal boiling point elevation constant for ,1? benzene is 2.530C/m. .'A.O.850 — gram sample of a nonvolatile compound with a molar mass of 185 g/mol is dissolved in 4.75 g of benzene. What is the boiling point of this solution? a) 80.50C ‘3“ r g M (1%; '3 . .,‘:’ » r?“ ‘ ' b) 80.900 fl\ Ziga-Dyé/lfl/l Lad-1‘4“ i3. 1_ (l 2,1.» .\ 11. » Consider the following reacuon anu u 1:: ylvcll Wm. 200(9) + Sn021s) -> 2002(9) + ,V , AGorxn = 5.300 kJ;/AHfO Sn02(s) = - 580.7 kJ;rAHf°oezeg1=—493.5 kJ; AWJ “\r Calcu'ate A G? = A - "321‘ a) 14.7 J a D T OVZ ’4‘ Aqg‘flflfl ga$€©tmng€.V-‘ c) 2.80 kJ LC F ' ‘ ' @ 31.5 J a e) 416 J j. 12. LaUryl alcohol is obtained from coconut oil and is used to make detergents. A solution of 5.00 g of Iauryl alcohol in 109.0 g of benzene freezes at 4.10°C. What is the molar mass of Iauryl alcohol? Kf = 5.12 °C/m', freezing point of pure benzene = 550C a 377 g/mol N. _ j/m M _ . 59W 1839/mol «m.» - ~_—- 1 92724—5 :, c 46.5 g/mol ” ’ <91 331w: d) 62.4 g/mol L} , 9 M3,. .1 M ‘1 ’ 4 e) 2489/mol i° l" ’ “A ’1” ‘ ’ 90173.43: Soc) 13. Calculate the normal boiling point of hydrogen peroxide, H202, from the following datazf N 992.29 Substance H202(g) 2541 H2020) AHf° (kJ/mol) -136.3 —187.7 S°(J/mol K) 232.7 109.6 AH? : - 1H" a) 144°C . L (,3 Q -: 32:31 9; 120°C . x iii 1 .jc)‘417oc “5 ‘ 5 . )58500 ., ’7" 4 9’ 312°C €332, - . . 14. Consider the following thermodynamic data: (u Substanoe S° (J/mol K) A3 1 '11 ' NO(g) 211 N02(g) 240 6 1,.le ’ NOCKg) ' 264 N20(g) 220 The value of A80 for the following reaction is- 117 J/K at 25°C. what is thej/absolute entropy-1.l ‘, of 012(9) at 25°C? , "x 4 _, 51210.91“ . A - “3w " O, i 1 Q, 2NO(g) + CI2(g) —'> 2NOCI(g) K334 1 z m 1? \il x10?” .. . A .2535, L. “.15,” JiL._....¢m_ _ _ .. 0% f f " I f _- , y . _, .. ,- 3:1 5:5 “.99 mnvmoxfifiyc V rrJ g2 __ _ MN--. @LC©_XZL\QLOCCLSI}OQD~*__3~D-_WELE_3MW.O;Q_._CL~C,€§\:§%’DC_LRWw... -4 __ \Co' ‘ ._w_.,_§;£3&£l‘;3m©§c._wrfig __ __ 50b .Qxc, 7 ' 0E. "5.3 ____-_____. _._\LX\SL\O_J.LW “is N - wuss (gC— fem: .. gm. movoggx _. V- _ _. ., , . o ‘ o _ " ,ZN @393! game ,L3)__._ H .er_..3x&?;0_ 4L)“ _ 7.10.1...0. -. ., ,, .f .. -- *r -—-‘+ . . an how. _, A: j? 1; _. I, Am.g.gg)._ r,.,..‘/_7. om). __,N_,Z.;Hg.'.u>ij+ go (45}. +1 . V2, , “)3 9253‘ T9120; Rog) H V H / . :i_, ‘i__'_";_j‘_?i 1‘; ;;__‘i‘ \J.<;‘\?:::)$ \ when w G 7 7, . §> 9» W\ \ _ _ (moms A . A, .mif’, Ergxcan.:;_ ~ s gnaw W'qu/ - " List the following compounds in order of increasing boiling point. Explain your reasoning iné terms of intermolecular forces. (9 points) l Ii 1 /, _n-butanol ngolmgen 39324:: r.___ i. w... ’l‘ M? " 03701:}??n-‘r /' J r '. Jfigqmicfiscmcmcmm CH3CH2CH2CH3 n-butane '— ’ 1,24,; / ‘ ? (\fffif‘,‘ " - 1’9»: woldlg CH3CH2CH2C= o _. butanal —r )<\ a ~ \ 1 4 fl , . l a H , . ,, M, H 9 , r r !‘_ A I. . ' ’ 1-1.? " ' u'”"~’ p_— bu” f L LA g, - L . I‘r- '... v P »- .n 101': --=.."n':_r...:. i‘fl'lflff‘n .r. -\ LU: / *- -\r“*'~v‘ Em. o bmfa'nwi M “M‘- “‘ WW <- ‘QLL. (1133:”. 0L: w ’I \ 3‘ ) \f. x ) \ \ \ A ' , " , a ‘ ' . ' . 4‘- N‘ H/ kid- .. 94 £63. fl Ly) (90" f‘ a" 1; '. ‘I‘fllfi 0~ Qua-UM _ _ . . x ' . 1 I‘ , J r .' .. 1’7. .' ,0 row Man. 1,3 {'1 ,6 -’_t , “1304M “. Vi " Li 71:1" DIN?) W - " . ‘3! f1?" l-LI'; 5"" fé‘f ll‘wa'u‘sfi [' ' WE» ‘5 '/’1 VJ "I I ' " . ~ - ~ I - . n \l 2. /_Diethyl ether (MW = 74.12 glmol) has a vapor pressure of 400.0 torr at 18°C. When a sample ,’ of benzoic acid (MW = 122.1 glmol) is dissolved in 384.0-g of ether, the vapor pressure of the \ solution is 377 torr. What is the mole fraction of benzoic acid in the so ution? (10 points) /” / I- \( . ' , A r , ~ 1, V - ‘A’ .- ~ 7 ;_ 7w»,- I .- ,- 1; - \ J; . Auk. I. a...“ ‘ V K. 'J ‘ I ,J' M 2.1 - J H j 7 4—00 firm q l2.sz mwgrgf‘x 713 gfL" 172" 3. a) Calculate AG at 25°C for the following reaction (10 points): _f. 324,920; ' a 5‘25 lfl ‘fi/vvw = 23‘? "7'4 5M- Ar 207% 355;”) ' 2:4“ ,1. —.1 3N02(9) + H200)—’2HN03(_D + Norm _ J ( .a ._ 17 :/ DATA: (AHf°(kJ/mol) “NSC (J/mol K) if, 4‘ ,- « -- “‘i' -i O“ 7 I ' '- "\‘ -‘ f 'v'r‘i ‘- a. a . V. [/- - I “llslg— Zif’ "al—‘f’ifia‘ AC3, =—. 4’12”; KNOz(g) 33.20 a A’ ii._.‘_.....§\g4o,o M i <9 L". PNo<g> 90.25 gig-1,7 A a @4200) -285.8 @5231 ‘ j fl: PHNOEG) 474.1 -25 a»; 4&6 . m ‘ F-M ,[ I - ll— 1 "A ‘ . ‘ :- wjtljg I L r ‘V J— ; '“ r V“ -" 3x$6¢49/ i A- ” 7‘ yr”, : , L. -. I. . 1~ . ‘ x b. b) Describe the temperature change at which the reaction proceeds from spontaneity to nonspontaneity. (5 points) \ ' 4. ' Indicate whether the following reactions tend to be spontaneous at low temperatures, high temperatures, all temperatures, or nonspontaneous at all temperatures. (2 points each) _ «r 8) N2F4(9) —+ 2Nleg) + Ni?” [flaws—“2&7 °=85 kJ n _ , f, arr‘q'fl '{2’1‘ h. {,yfigallarnykhw l l I ‘ I b) CaCO3(s) + —> Ca0(s) + COzglqiiétti C 58“ AH°=178.1kJ ‘.v—€y-)~.]‘_‘;,J @ \ j :""m“”" --\;. ., u 0) N2(g) + 3 F2(g) ~——> 2NF3(g) 1. 2’; L w, _249 kJ " " 4.; Us w WNWV 'f-r .1 M.—_ d) CzH4lg) + 302(9) “9 2002(9) + 2“200) Ag WW I A I"? * Helm gems-rt 1 ,. ' e) N0(g) + E Clzlg) H N0C|(g) A5”: « M ’ AH 13%;? “xi-0W” ‘Wfif’KiEf’i‘fi 5. Substance AHfO (kJ/mol) ("302(9) H I '3 m (L); - < its 5 J HCl(g) - 2.3 / Calculate the amount of heat evolved (in kJ) when 6.504.; of 802 reacts according to the following reaction:(1_0 points) U p. : I 4.-/ .1" . If. 302(9) + Cl2(9) —-—> 3020'2(9) “‘ " ”‘ " ' / v \ l u If, f7 ’ hf V .5 '5'? D‘/ W {:1 5’ I“ : (/1141 I / :2 l C lmrl _ . _‘ w _ \9 I v ‘4 .___ y\ _d ‘0 it] Jig/ff: a, ‘1: A ?~,AI;§:T“\ 043. o - ' D: “ f. '1. .‘1’: 393 "’i 6. Calculate the osmotic pressure of a solution that contains 1.22 g ofsfucrose QMW = 342) dissolved in 100 g gvaater at 25°C. (Assume the volume of the solution is 100 mL.) (8 points) R = 0.0821 L atm/mol K :3" 121’” E 222% W: i8" ‘ ‘flfifiJ 342—3, - poefrcmg. 7“: 2‘2”) I :J' r 9 K v ‘v ‘ .WQL / 9035 2A.- waf- , ,. . ¥ , ; a ,_ _ “T? 1523996 71-11.,5fésza Mg: §stiVES If} _ VLIYXCIJ'QC’rPIIuC-UM. ~ H?".’.L rferG-r'émk . 7 fl Lgyghaf’180/5X’Ukbfe 33 boa:on acid" / , f 053:, , , $dx_u_fi\,.bcnzooj€ , 04 1540M mm (ma) , ~ ~ ‘ 'ngé f. ; Lag/01‘? ff, W X_,.1000wy‘i./ ' f-\. r~/“ k 0 “re 1m.) ~——7 zug (‘7 (cf? Ofi H20 7. _. ¥l¢ZQOISImL - WW‘S. _ 7 some/{1+ “ 2'ng * H3?ng " mg. ’: 6:913Wm ; ., ,. ,. 77,. r. r. U W. ,,.. ._ r . , 235%» ' . , H—— ...
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This note was uploaded on 06/15/2009 for the course CHE 1113 taught by Professor Powell during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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final - _ I W 'l. . Which of the following is primarily...

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