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Chemistry Exam 1 1997 - Jam/ease iJHEMIST'RY 112 FIRSTEXAM...

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Unformatted text preview: Jam/ease; iJHEMIST'RY 112 FIRSTEXAM FEBRUARY I4, 199‘:-' l'iNTER YOUR NAME AND ID NUMBER ON SIDE ONE OF THE ANSWER SHEET. THERE IS ONLY K ONE PROPER ANSWER {THE BEST ANSWER} FOR EACH QUESTION. THE BACK OF THE PERIODIC CHART HAS INFORNIATION {VALUES FOR CONSTANTSJ 'WEESSARY TO ANSWER SOME QUESTIONS. SOME FORMULAE WHICH MIGHT PROVE USEFUL ARE GIVEN AT THE END OF THE EXAM. GOOD LUCK! 411 H : + :‘L l. Considerthevaporizatiou ofwater. agony—s magnetizing place at 1 atmand tos'c.- A‘3 = t ' .9 T939999“ Signs ffll' 5-H. as and AG for the reaction under these conditions are: " ‘ 95 ‘ f {lix.:+++ 12} -~— (3} —+— (4) +—+ (5) +4.- R? How much heat is required to convert a 11} g cube of ice at “1131?: i9. 11) g of liquid water at BS'C? Some necessary tl'iermodynarrtic information is the Mic—heafifiee {(1.51} e'svgtj, the specific heat of liquid 1nater {LEDEallg “C1 and the heat of fusion of recon kcalfmoij. _ ' " g, _ (1} non cal (2; 414 cal ear lm'c'al’ Tan- 14o4o cal ts} 45o cal I"? :: re 6 c. I 1 " t c f A F 3. Nitric oxide, NO, a colorless gas, combines with oxygen to give nioogen oxide, N01, a brown gas. Calculate AH for the reaction: 2 NOngJI + 0113) —:=- 2 NOEfg) from the following: Nets} + fists) —:=-2 Nflts) nH=+rso.s 1o , __N2{g1 + 2 021g: ”re-flit) em = + 66.4 s: @1—1142 1:1 {2} +1142 {3} —223.4 M [4} +2234 id {5] 494.8 kl ‘I a“. T I. ‘I' —..|:| D I‘i' I.’ “x 4. Calculate AH' for the reaction; C3Hgtg} + 9 2 g} -—-:::- BCOztg) + EHEOtl} A .- 2.; I Some AH“:- values that you will need are: +21 rnol for CgHgtg}; 4:94 kJIInol for C0213}; ~23oklfmol for 1“" ‘ ]}_ _ . _.____ " L2. - _:- {1) _-2Ufi1 s: {2; —2ots to (3} cot to on sets to (5) 211611;] F o. ._ z -" - .. ' 5. A more specific name for the reaction heat calculated in prohiem 4 above would be: (fig/the heat of formation of Cal-14g} ‘ ' _ TEE-film heat offiTsIfifi of Cgl-Ifit'g} ' me heat of vaporization of C3Hgt‘g} Me heat of sublimation of Cal-lgtgj .. 3(5) the heat of combustion of C335Ig} .x“ ' QUESTIONS 6 S: T WHICH FOLLOW UTILIZE THIS TABLE OF BOND ENEROIES Average bond energies in klfmoi fie-Pr“ LLB died at CFH 413 SH 391 0—H 463 _F 155 Bremen C—C 34E N—N 63 0—0 46 C1—C1 242 1 I |—-- TQQm] (CI—N 293 31—0 121211 H—H 4315 Br—Br 193 1:243 353 __ f, . -| “I U .. 1“— _ I. clandestine: . Q 1 i .. L “x .' 4' c" A . .- ,3»- \ . / H "" ' Cat: sss NEH s41 c=o ass - *\ . ' x -. ”’- l Muc=t~t e15 can set (320112192 s - -.--' pl H: 6. Using information from the average bond energy table above, estimate dH for the following reaction: ' H20 + CD —} H1 + C02 /..~—m~ . - {1} 1993 id {’2} 41032 it] [3} 132 It] {4} —se it] t [5} none of these is correct It. H—CaC—H + so 02 —:- 21:20, + H2O 5’ ‘i .. {1} esots to {a} —24ov-5 to {3) —tte.5 1o {4} 4219.5 to ES} none offl‘tesc is correct 1". Use the table of average bond energies above to calculate the heat of combustion of acetylene, (321-12: ~ PAGE 2 - was; in, 3_ Which of five r ' as shown below is up; a eseutative of a standard formation reaction?II M s) + 351 is} —:=- MiG-ifs} 111+ {Style} _—;1- M20311?“ its} + lfl'02iE) —‘-=* H1011) t4] Natsl+ 1112 {31:131—3- Name} 17 ,“iSlMeis-l + Exam —:1- MgBrzts} -_,-- nus /9/1 A 5.1] g piece of a metal with a. specific heat of {13!} calJ'g C is placed into if [Dml 9f water [specific heat- - 1.1:1 eallg 'C) initially at E. 1] C. The temperamre 11-11111 equilibration of the and water is 3i}. {1 C. What “51:4? was the initial temperature offlte metal? 1 :1.“ E: 361’ (ET +1; :3 {1] 531°C [2} 931°C {3} 153°C {4} 2153'C [5} 363": it}. Gigen the following enthalpies of reaction: 1 2 1111113 era/6”” .. _ =_ .-- 0} z 11 1.. 1111111325; puma 2C + D me- E nil-i=—15 klfntolc 11111111111. 11-111. enthalpy ofthe reaction 11111111111 111 111111111111? -- do 2.151 + EB +D —::-E I); ' I1 5’ (1:14.115 1:23—45 13:14.15 1431+1s (5)45 l 1. For any closed system [such as the universe} which of the following statements m [I The energy and entropy are fixed. I12} The energy and entropy both tend toward a maximum. 3 energy is fixed and the entropy tends toward a maximum. The entropy is fixed and the energy tends toward a minimum. {5} The entropy is fixed and the energy tends toward a maximum. 4 1 Letter we 12. For the process CHC1311111 —‘:.1- Cl-iClEm. nH' = 9.2 kilmnl and 1115' = 43.9 Jlmnl.K. What is the melting I int of CHClylsl. chloroform? 11 111—153 C {2} 219°C (3)5“ C (4)153‘C [531—5‘C .- ,_ C 0:5Hrfeirfié’30é’flJ’fiifitc '13-:- 13. sitar-solute zero 151er would equal 4. : _, e-1' _. O __ (110111111101 1:21 (31% (we (no? fags 3. rig/Ml; THE NEXT THREE QUESTIONS REFER To THE RancttoN ssLow AND THE GWEN para 0 __ 1. CHng + 2 02(3) —.~.~ coggi + anyom . - C 1. (3:13 71 +§1(-?8’S.33+L1 i-"Hs Compound and {1111111111} nG-ftknmnn , r“ cans) 44.9 —5o.s — 5395 1 3 1‘" 7nd. 1:02th 4193.? 4194.11 1 _ _ ._— e a 9 H2011} —1f.ss.s 437.2 4.; -’ -- _.1’— 3-41 .1 t; 1t gfi‘g '1. '11; age: 41"“ ' = .4— 14. What is the standard eitjtfihlpy ofthis re en? fig“ , _ El ii“ C: 5 (1" (a 1:1) 151114.15 11111111111 1:211 -so4.sk_11mnll 131 -—39fl.4kl1'mol 14:1 sso.4klnnnl (5:1 -lfl4ll2k.l1'mol ,/ {1} —531.2 kll'mol (2} 53L21tll'mol (3) $69.13 kllnlol {4} 359.3 kllmol -818.4kll'11’101 16 What is the standard entropy change for this reaction? ‘ 3 1 "E' 4 '— ' 3 ‘lfl ‘l— ”(301 .- {l} —t2_1.242 J?molK [2:1/I/6.-'}‘*Jlmol K [3) 51511111111111 [4] 242l1'mol K {51-24211'mol K l5. What is standard free energy of this reaction? l (5] "1'. The value of the equilibriirm constant for a chemical reactions has a yaiue of 5 at 25 “C and fill at 35. C. Wha} is the enthalpy of this reaction in kllmol? __ ..__ . P“ (2) 41:1. 1 [3:1 +142 [4:1 474.2 {51 41E .1211; _/_{_.- :. 1'___1:~-. ;: rf in :' xjé- fl d:— Xfl _.¢-‘1 f._ G I? 1 .2 ":o fife" ' ' .131; ._| 'J 4'1‘5 4? 74%. i {l} 25°C (2] 25 K (3} lflflfl K . Warehouse i [1] positive I (21 __ posititrc ($1,199 negative uegah re {5) zero tilt-a ‘9 Ki :3. The enthalpy!r of a chemical reaction is + 34] idling]: temperature will this reaction have an equilibrium for the following reaction is CrHizflstSJ + 6 Gets] —-2- 6 {302(3) + 5 H2011} 1:. -PAGE3- IE4) NWT {5) none of the above 21. The equilibrium constant for a reaction at lflD’C is [125 and the entropyr change is -3t'l limole K Calculate enthalpyr change for the reaction in itllmoi. {4:11 "4:135 —[55 "$22.4 appearance of CHZUt'in hits} osox ro-t Lox 1er Lox ro-It {silt _ i} 1.5 x 10-7 r‘ to x ro-EL so it I'D—13 -—i t. f ,1 S «We LDX to1 sex rot nor: to” 3. O h” it! - W 1.5 X Ill—'5" 2.0K [El-3 ISJJX I'll-12 - lL ' f.— C, K F6" 23. What is order ofthe reaction with respect to 03? f 7 1 M ti} o @1 {3i 2 (4} 3 {5) 1:2 5 : g;- _} 24._..What is die order of die reaction with respect to CZHJ? a; P Wt: {yd j; trio {2} 1 t3) 2 (4} 3 {5} its _ pens .2 w 25. Ixihihat is the val of the rate constant for this r ' ? ‘1': If” (I) 2X iii“3 ‘l [2) 2X It'i3 M‘Es—I H3) 91X 103 M‘is—I {4) 2 X “:11! s‘I [5} 2 X ill—12 s“I ~— 26. If a reaction is first order and has a ha1f~ starting material in that reaction to disap [1} 15 hrs {2} 3i} hrs {3) 45 hrs pear? life of 15 hrs, then how long would it take for 76% of the original t' 41:22.5 hrs {5} can't be determined without more info ation 27. The units on a third order rate constant . in which time is measured in seconds would he {1) rt {2} Ms" (3} M'ls—l {4} arts—1 ((5) M'isrl I I' ~PAGE4- 23. Which of the following makes a complete. line statement? -. A catalyst speeds up a reaction by: WHERE the activation energy #4 Increasing the reaction enthalpy changing the equilibrium constant r .. asing the activation energy {5} increasing the activation energy,r for the reverse reaction 29. The rate constant for a reaction A —‘:r B has a value ofS at [El-3 s" 912513 and a value of 2.5 it lift—l s—1 at SITE. 1|ir‘t'hat is the activation energy for the 'on in It]? {I} 25 {2} SD [3] T5 (4] 1m 25 I. __ MU -'_ lit”- ~-."fl I‘ _._> 30. ' h of the following statements about a first order reaction A —:=- B is fatal: éfifi plot of the concentration of A versus time will give a straight line. J The halfljfe of the reaction will remain constant throughout the reaction. Wuhiing the concentration of A will double the rate. I {We rate of the reaction will change throughout the reaction. \ginhe units ofthe rate constant for the reaction can be a“. _ ._ 'Mflf - 3 i”: “' 5 ' an :35 “c .: k. - o m ' 3. f ”x ' “‘13 - 5 -~-- ' _ f'lru '-' If 1" "' d I _ . m ___ __F.__ '—— ——--q. USEFUL FORMULAE “.3": .7 q F 310 = fiG' + RT IN} I: = ate-Ev“ or inflt} = tan — [Eaten for a first order reaction A -—:-.- products innit}t = lube]:I — ltt TURN IN SCAN’I‘RONS ONLY. ME BLE N W YOU MAY KEEP YOUR EXAM PAPERS. A KEY WILL BE POSTED IN THE LOBBY OF THE SCIENCE BUILDING FOLLOWING THE EXAM. O“ ' ‘ -':'.'HEMISTRY 112 FIRST EXAM JULY 7, 19'9"? ENTER YOUR NAME AND ID NUMBER ON SIDE ONE OF THE ANSWER SHEET. THERE IS ONLY ONE PROPER ANSWER [THE BEST ANSWER] FOR EACH QUESTION. THE BACK OF THE PERIODIC CHART HAS INFORMATION {VALUES FOR CONSTANTS] _ NECESSARY TO ANSWER SOME QUESTIONS. SOME FORMULAE WHICH MIGHT PR VE USEFUL ARE GIVEN AT THE END OF THE EXANI. GOOD LUCK! I; .1 I’d 1L {”5" N t!‘ l. Winch ol‘ the following substances would have anon- -. u- .. .-.. r am“? to Hate) r2) erg} or age) {4) Hetl} @ 2. We have taken special note of the temperature dependence of the following thermodynamic quantifies: nflm AGm Aern and S for a substance Which of these is(are) highly.r temperature dependent? l} onl},r Alina: (2} onlyr AGnm [3} onlyr ASnrn {4) only S for a substance otlr Aileen and S for a substance 3. The speci at for aluminum is [139 llg‘. What is the molar heat capacityr of aluminum in llmol‘? [I] 2‘? 4 (3) 3'93 (4) {1033 {5} 39 THE NEXT THREE QUESTIONS {4.5 St Er} REFER TO THE TABLE OF AVERAGE BOND ENTHALPIES BELOW Average borr energies in kllnrul Sinelaflcnfia C—H 413 N—H 391 O—H 463 F-F 155 C—C 348 N-N 163 O—O 1415 C1—C1242 1 I C+N E93 N-—O 2t“ H—H 43a Br—Br‘ 193 are C-O 353 C=C .514 N=N 418 O=O 495 CEC 339 NEN 941 C=O T99 C=N 615 CEN 391 CEO 1972 - u - 1.: c above to calculate the heat of firrrnation of Hgfltg} in kllmol. {Q (G d‘ H) w {a} 32 {a} 4.1s4 (a) so (511 —l'5.3 — H 5. 0mm armamemacuanbem- _, ' .. H a a: .5; w _ Cline] + mite) fiaflifigfi: £9213} H E c... J _ iQLW {3) acts MK {:1 +14 ,5, -. I ""l- - ' h.- ti. Consider the reaction: Hgtg] + thg]: _:;. EHFILg) ’1 ' > I 31.? 3‘13“:- . The value of AI-Irxu' rs —544 kl. Using this information and the table above, compute the bond enthalpy of me H—F bflntl 1n kllIntZJL ": ‘ .- {1} 1135 {2} 4T (3} 23.5 [4} 272 “CED“ T. The entht-‘tlpjr for the chemical reaction in problem 5 above could pt - _ be called a _"_ t1} heatol‘forrnation [2} beat of solution atul" combustion (4} heat of fusion [5} beat of vapor-irration 3. AS ' W system when: (l) T: 9K [EL T25 CT: ) system is at enuilibr'iunr (4} all substances are gases l..- (5} these quantities are never equal — PAGE 2 - I THE EEIcrEIRE ooEsIIoNs REFER To THE RErsICAI. oR CIIERnCAL CHAnoEs EELow. EoR /’ EACH PREDICT THE SIGN or THE THERIIdoIrrIIIAIIIIC QUAETrrr IF THE IIIIEoRRLAIIoN Is SUFFICIENT. 3. HEUGJ—Ie Hgfl[g}ailfi°c.latm dG‘i-atjj— 13m (41 more IereI-meued deeded fig (21- (3)1] (4) more IIIIeeIIIeIIeII needed 11. H10(l]—} H+taq} + GH-(aqjt a125“C.1atm EG" i- 111. HIUflI—e H‘taq) + 0111an e123°C.IedII As 1 1:31— (3)1] {41 more IdreIIIIdIIeII needed 12. Hzfllsi—ze H2013} atES‘C. 1 atm dH“i {2} — (3:11} (4) more information needed 13. H213} —:.~ 2Htg} atZS‘C. 1 arm EH“ 1- [21- {3111 {4] more information needed 14. A 23.2 3 sample of nickel is heated to NET and clulclrlj,r planed into a coffee—Cup calorimeter containing 1511.1] g of water at 23.513. The temperature in the calorimeter is observed to rise to ESJTC. W is the specific heat of nickel in Jig“? [1} 33.4 (3} 33 {3) 4.134 {31 11.11355 THE NEXT FIVE QUESTIONS {15. [9} REFER TD THE REACTION AND THERMDDYNMHC DATA TAEULATED BELOW 4HH3[g} + 701%} —:‘a- 4N0fig} + 151-130(1) ”dc 1* awe; ——) 4111111-. 1— “11d: cr'I-I NHIteI .NOeie‘l "J H1011) IiH°t {RIAIIIIII —4ti 34 ass AG°II§IcIIIIIeII —II :12 —333 [5. Jr —-. °1‘or dtereactionahoveinkl‘? [email protected] {:11 —IId4 131 +IId4 {41 43313 15} 43313 it}. 1|IEI'hat is £16" for the reacti- .--- . in id? 111 —1314 (21 -—1154 may I141 +1214 ' f5}"—'15$fl' IT. What is d3" 1 ,..- 4:. 'on above in ii“? (1} {1.339 @331 4346 {4} —li} {5} +111 Hi. What is £113 mm for the reaction aha. --~ - 'ttr attire ofdflli K? [1} —dflt] [2} —1214 {3} I] -.'..- - '-.tion spontaneous at 25°C . and is it spontaneous at 6011K? [2} no. no {3} yes. no {4} no. yes {5} this .. too is at equilihn'nm atall temperatures Ell. Consider the follow Ing three reactions and their corresponding standard enthalpies. ngg) + 112 thg} —3. [120(1) nfi‘mn = 4315 k] —154 kl Ents} + 2HC1taq) —::- ZnClztaq} + Hztg] Eta-red Zflfliii + 2111311311} —=* 34011an + H1011} Adam = —33RI H“ Use the above information to compo = of formation of Znflts} in Himol. (1} 494 [2} —532 [3} +532 1 A1. - - 1121612111111 @131 name (4} K: ts) Q 21. At absolute so [1} t] irifmol ' to ease + as 01(3) —:=- Allegro {3) egg; + to szg) —s Hgflfll [5) Mgts} + Bram “—5- MgBrzlsl 23. A certain chemical reaction has a favorable free energy change at high temperature but not at low temperature. Which of fl'ifl following correctly describes the enthalpy and entropy changes for this reaction: enthalarshaaae We @ positive positive positive negative {3] negative negative {4] negative positive {5] zero zero 24. The standard free energy change for the following reaction is 4332 lriimole: Cal-Ilgflds] + ti 02(3) —:=- ti Cflgtg) + 6 H100) What would the free energy change (in kimole} he for this reaction on a planet where the temperature was -' ssnrc of CO: was ll] atm and Ihe pressure off): wash. 1 atm. ‘i' {2) £98? {3} 4946 {4} —3[IE5 {5) 3—12U 25. The com riuni constant for a reaction at ltlfl°C is {125 and the entropy change is —3tl Jiniole K. Calculate change for the reaction in klirnol. .411]: —e- 2} +6.9 {3} —l5.5 {4} +l5.5 [5]: +214 26. For the process CHCl3t5'J _;. CHC13[1}1fiHD——.g 2 kit'uiol and as‘ = 43. 9 3mm K. What is the melting [3113}, chloroform“? 2) 21fl°C {3H° C {4-} 63° C {5) —5°C 27. The Rap for allgtlrfityr is H X Ill-l2 at 25°C. What is the standard free energy for dissolution of AgCrU4ts] in kii'mol'? ”si- [1} trash is; see "flea—39(4) 2.7x 1th {5} c 23.21 5. {l g piece of a metal with a specific heat of U. 3U callg °C is placed into lflll ml of water {specific heat— - 1. ft calfg °C} initially at 25. if C. The temperature after equil' ration of the metal and water ts 3i]. 13" C. What was the initial temperature of the metal? [1} 63° C {2] 93° C {3} 153° C {4} 353° C {5} 363° C 29. For which of the following processes is 3.5 negative? {1} dissolving a salt in water (2] heating a piece of iron from 25°C to 35°C Qcompressing a gas from a volume of ltlL to a volume of IL at constant temperature It suhlirning a solid {5} dissociating a weak acid into its component ions 3d. The thermal decomposition ot‘ainrnoniurn nitrate into dinitrogen oxide and water has ntH° = 424.6 ltJi'mol and h5°=2tl3.8.lfrnol°. Whatisthe equilibrium con i I 's reaction at 25°C? (1} 3x to” {a} s it to—1t (3} ex lift-33 W t5} none ofthese is correCt An equation which may prove useful in some prohlerns is: M3 = hG‘ + RT int} The specific heat: of water is 4.134 Jig° TURN 1N SCANTRONS ONLY. MAKE EUEE Yflllfl EaME; am; if! ARE BUBBLED IN DJ ff C’ // - cansasrsr 1 12 FIRST sxasnnanon .2” JULY s, 1995 PUT YOUR NAME. ID NUMBER AND SIGNATURE ON SIDE ONE OF THE ANSWER SHEET AND FILL IN THE APPROPRIATE CIRCLES FOR NAME AND [D. THERE IS ONLY ONE BEST ANSWER FOR EACH QUESTION AND THE BEST ANSWER IS THE CORRECT ANSWER. NOTE: Loon cal = 4.1s4 I "1110’ ”fich- Hz 9 [”3 DIJIAH'] .l- The solubility.r product constant for leadflli fluoride [2.45.2 gimol) is 3.15 x 10-5 at 25’C. What is the SOIuhililjf “1.31.21 of leadfll) fluoride at this temperature? mom @12.osx1o3 moose (41oe42 (5}Noneot‘tl'uese v fiber is the molar solubilityr of the leadtll] fluoride in the problem above?r @311 it 119-3 [2} 9.1:1‘:Ir.ll.‘i"5r [3} 1.9 x104 [4] 9.5 I III—5 Q 3.5 x11)" 3.Wt1at1s the Concentration of leadflfl ions in a sa = a-- - lutien of lead-{II} fluoride? (9 4.211111r3 1211sx 1o-t (311.91: 1o~1 E 2.111114 (53.11.15.111oe1 -1-'h.lr£i-I1L--hhi"-L- uWhat'is the concentration of i‘littiride' was in a saturated solution ofleadfll) fluoride? 4’:'-€I)42xlfl'3‘ (2)1311?“ {3] 1.9‘tt1JIIIl'4 {4) 2.111D‘3 [5) lottlfl" The ooneentration of CO3?- in a saturated solution of AngOg is 19 X 111—5191. What is the Ksp of AgZCOa‘.’ 1/ 1:111:92: 11:1-5 (2133 x 11149 (3:15.? 11:11.14r E 2.11 2::11H2 (5) none ofthese is correct a The Ksp of Canon): is 3.2 X Ill-1" What is the pH of a saturated solution of cadmium hydroxide? {1) 4.71:} {2] 4.4!] ' (3] 9.313 a 9.451] (5} TI] «’1 . . t The K55: for Ag'ECrO4 is 1.1 X I'D-13. Calculate the molar solubility of silver chromate in a solution which also ' contains fl.dt{lMNa1CrO4. {11 1.11:1on (212.2sx1tr11s1 (31 1.ox1o~51~.1 E seam-61a @asxmasr \/ g The pH of a sa solution of (2111(0sz is 3.90.1131'hat is value of Kspof CotIOlth? {y} LOX 113-15 2.5 X 113-15 {314.6151 10-” {4] 9.4x ill-13 (5) 1.63211?” IN THE QUESTIONS Tl-IAT FOLLOW (9'15). PREDICT Tl-[E SIGN OF THE THERMODYNAMIC QUANTITY REQUESTED FOR THE SYSTEM SHOW {+ for positive. — for negative. Ct for zero] 1/ 9. H1O [l] —> HEO {g} at lflD‘C. l atrn dSsystem = ‘3' m0} + [1} - [3} t] [4) moreinfortnationis needed H011} ---—3-- H D {g} at. 100°C latm ASunivetse= '3' + [2} - {311d {4} moreinformation is needed 11- H1011} —3" H1013} at IUUIC. 1 atm AHsyetern = '1 0) + 11} - (3} ID [4} more information is needed 11- H2011] —-:=- Hgotg} at not: 1 atm figsystem= *1 £91 + 121 * 13) U [4} more 1nfortnat1on1s needed Ill-{101:1} —".‘-'* H2013] atllU‘C. 131.111 fiSurliverse=?-I I"rel'le— 4—1—1 {3} + [3]“ {3} l} (4} more informationrs needed I: 1'.—_ —._ 14- Ag[5] at [l K. 1 atrn Ssystem = ‘3' 1111 + {2} - Q} {i (4) more information is needed I 15* MS} 31 25.11:. I E_t_1.l]1 Aflsystem = T ' . 7“} ‘1' G) ' I31 I] [4] more information is needed - Pace 2 - -. 2 '- ‘2' / us, What is the heat capacin of mercury it‘ it requires 131' J to change the temperance cf lit] g of mercury from .3. 11' 25.331: to 53.31:? g , rif- m flux 10—3 Lig'c [2) 1.1221 1341ig'c is} 3.445 Ii'g‘C (9 1.33 Jig c (5) 313 Jig c The temperature of a 5i] g sample of aluminum was incteaSed by 5.02: when it absorbed 22.25 J of heat. What is the specfic heat of aluminum? (1) 1.33 Jig K (2} 4.13 Jig K {3} 3.33413 Jig K (4} 5.3 Jig K @1133 Jig K VII 3. Nitric oxide. NE}, a colorless gas, combines with oxygen to give nitrogen oxide. N01. a brown gas. Calculate dH forthe reaction: 2 Nfltg} + Orig) —::a- 2 Nflzm) firm the following: Nae) + (12th —5- 2 130th an = +1333 ltI Ngigl +202Lg1—h-2N03IE3} nn=+3s41rJ {In 4114.2 kl (2) +1142 13 [3) .2234 1d (4) +2234 11;] (51—2343 kJ viii-IL Calculate _dI;I‘ orthe reaction: _ CgHgt’g} + 91'? G }—:=- 3CD:(g}-+ iflgfltl} . ' - a 'sa'rne' err; 31313311 will nee-:1 firef -+21 mo r CgnggJ: 434 kJimcI for 302121; —23ekJimnt for H2013}. . {fl} -2fltil kl {2} 4019 Id (3} wJill id (4) 2fll9kJ {5) 2061ld f 211']. A more specific name for the reaction heat calmdated in problem 19 above would be: {1} the heat of formation of C3Hgtgl [2} the heat of fusion of CgHgfg} [3} the heat of vaporization of CgHgtg} (4} the heat of sublimation of CgHgtgl @ the heat of combnstion of Cal-Igtg} 1‘ SEVERAL QUES'fiONS mCH FOLLOW UTILIZE THIS TABLE OF EOND ENERGIES Average bond energies in ltJi'mol 34131 t ”'1 f meanness figs +132 i ‘ - C—H 415 H—H 331 on 433 1=_r= 155 C—C 343 13—14 133 o-o 143 31431242 (2—14 233 ' 24—3 231 H—H 433 3r_3r 133 c_o 353 ; W l»! ‘13-” - ’ ~' 3 3:4: 314 14:13 413 o=o 435 "L"? ‘3 ”5 Csc 3:13 New 341 o=o 333 5. i333 -2343 “5 C=N 1515 Cell 331 o=o 1322 3-” '_; :2 F21". Using informat...
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