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C112BT1F03 - At constant pressure the combustion 015.00 g...

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Unformatted text preview: [. At constant pressure, the combustion 015.00 g oszl-l‘m releases 259 Id of heat. F31“ What is AH for the reaction 5.1195531 below? (i QCszin + 702m) —’ 4C03(g) ‘5“ 6H20u) “(2/ gamma AH: €4,th 4‘70: 61/ b) 479“ 2501K; c-Ir op fl“ [0 C) _86'410 duh. {3: 5.00 25'0”"? ’- ‘3‘06 LB: / d} 456010 30.02.. H Quinlan, i' (1M9) 50-0} e) —3120k} (SM-09+ (of. 30 -OL Most chemical reactions are can-led out in one or have ways: I. in a open vessel at constant atmospheric pressure II. in a. closed vessel at constant volume r ,(uQ Which of the following statements is m? A8 ’ 69 9w W5 (VD AH = q for condition I and AB = q for condition ll 4 CK b) AE = q for condition I and AH = q for condition II. 2. c) AH = w for condition I and AB = w for condition ll d) AB = w for condition I and AH = w for condition ll e) AH = q for condition 1.1 and AB = w for condition I. 3- Which is the most soluble salt of the following set at identical temperatures? m Ba(0H)2 with K“: 5.0x 10'3 “twat Solubi ML) b) Ca(OH)2 with Ksp = 4.7 X 10-6 c) Cr(OH)3 witthp=6.7x10'31 ”reme!fi I I d) Cd(OH); with Kn: 5.3 x 10'” "'___-_'" __ . ._-— mam KS? e) Fe(OH)z with K511: 2.5 x 10‘37 0\ 6. 7 O u. c'lhtV' One mole ot‘a liquid 18 vaporized at its boiling point 80. °C and l. 00 atm. The AHHP for this iiquid 18 30 7 1d / mol at 80. °C. What is the value of_w fi'om the J) perspective of the system? gs ”K: 3 t0 :1ng ac“ a) 29.4J . hump 50:1 ' ‘3 magma. 7V5" . V0? ‘. '. b) -29.“ 60m m5 {oW’f‘ab C- .bwg “ad- I + be. ' u 2.94 x101 J , ' can e/ W W .. —2_ 0’ d) 9“ " 1 J M . W D» e) —30.7kJ _ MEL, 2 Using the result fi-om the prevmus problem, what 15 the value of AE for the ‘1 £1); up system? {D a) 1.30x103J fig: 9‘ OMXW ‘3) (j b) 4.30;; 1031 A8 5 _ \P X c) 33.6 k} Y’x X Cab ”b b 0x What is the concentration of Mg ion in a sa lution ma e by dissolving Mg3(PO4)2 111 water to form 0. g§9_I;Mgg(PO4)z solution where the concentration ofPO4 is 7. s x 10“ M? [Nfl . -5 a) 2.3x10 M H O __) 0960 L quCWu) b) 4."7x10 MB “$5CPQSDZ'K' 7' 3' .< 3 3 0’9 1:909 I 'c}-l.2x10'[5M3dé:: :0} CPD“! '19 l W"). ' 6M 4 [1‘8 I J'o'wf X -‘- 7 - d)--3/2xIOM1-U‘ 027,3[1'9x10 3 @I Cannot be determined without knowing the K59 for M33004); 7. It'the solubility ofBa504 in aqueous solution is 1.3 x 10" M, what is its corresponding Ksp value? a a) 6.8 x 10-10 be: SOL‘ dz [5&5 [SO-(1 b) 1.3x10'5 ‘ DU 5x3 Q 3.6;;10‘3 No in Y2” 1.7x10' . Soiucio’ ’“nm e) 1.7x10" 8. Which ofthese dependsMon the initiaiandfimlstaze? <4? aJQ Smog: 0 éieflsk @m M d)q—w e) All of the above are correct. _9. A 25.0 g sample of At (molar heat capacity of 24.03 I / moi - °C ) is heated to 82.4 °C and dropped into a perfect calorimeter containing water ( specific heat capatity of 4.18 I / g ' °C ) initiallx at 22.3 “C. The final temperature ofthe water 6 is 24.9 0C. Calculate the mass of water in the calorimeter. . T" a)/.57g 35.0 031 03‘ m}, W®f5fi9 (5: © 212g 1AA" I ? 0 mo. rm + @342 d) 3180;; e \I fth ' ~ t‘ \xx qimc AT ) -. oneo eseis wrrec’r. quq'gi‘h L I C, A: ( 10 A solution is 0.010 M in each oeri', Mal: and Nil; Solid NaOH is added until the OH' ion concentration of the solution is 3.0 x 10*5 M. Which of the following statements is true? -/' . 7,? ‘ I Iproer(0H)2=2.8xio‘1° Qio -—) 0-1)thM / 1’? 0 L KsyforMn(OH)2=4_5xIO'” “N fiO-Ol H ‘ 2*. 3 KspforNi(OH)2=4.5x 10'12 W: ——> No precipitate will form. ‘ E, 3'C Only Pb(0H); will precipitate. No C) oniy mom; will predpitate. dy/Oniy Minion)2 and morn2 will precipitaie. e) All three hydroxides will precipitate. 1 1. Which is the com-ct mathematical expression for the molar solubility (S) of zngrpoih? KS? = 10433 I Z“:ZED"&£ E'an 3 DA 6 10168’ (Xi (X) C77 9 33%;? c) 5455 . W 43?, d) 72 5’ ® 103 s5 12. What is the solubility in g I mL of barium carbonate, BBC/O3, if the K51: for this salt is 3.1 x 10-9 at 25 °C? \{7 a) 1.6§_fl'3_g_/mL EQCO -; [C173 %/ \h)-_1-.3.L1.OigJ-FH}:) c) 3.5x10'5g/ml. @{iexloig/mL CpOC-Kj ESQ; zci i . . z j . i)“ / A e) 3L‘23‘q10 g,/rnl// ,A : (T'I/II/XJ« \f\ y a.» \O I3. What is the molar solubility of Mg(OH)2 in a basic solution with a pH buffered at I I 00? ( KS1! for Mgmii)2 is 5.6 x 10‘”). a) 5.6 x 10'9 M b 5.6 x. 10*5 M Y5? c) 2.4 x 10‘ M d) 5.6x10'fl M e) 1.1xio4M 14. Consider the following dissociation constants, mm, for a series of Ag‘" ion complexes. Which of the complexes will have the least tendency to dissociate? a a) Agarg‘ ;K.fi..=7.3x10“‘ b) AgCh' ; K45" =4.o x 1015 ® Ag(CN)2‘ ; Kain: 1.8x10‘19 d) z‘\3(1‘1113)2+ ; Kim = 6.3 x10“; 3) Ag(5203)23' ; Kim = 5.0 x10'14l 15. Low solubilin of nickel salts may be dissolved by adding ammonia. This is because ammonia converts Ni2+ to: ’b a) mom; X “‘6 Li {Q Ni{NH3)62F N\ ‘ c) Ni{H20)62' d) I‘Jifi‘lTrIak+ e} Ni{H20)f' 16. What is the solubility of PbSO4 in a 2.5 M Solution of sulfuric acid at 25 °C‘? qu obeSO4 = [.06 x 10*. Note: HZSOJQMD "‘ H‘GWU + H5047”) ( coranete ) 0 H3041”) <'-* H754) + 50422”) K: .020 6" 2 V a) 5.3x10’5M H3041 b) 2.0x10‘2M —t '1 C; H 304‘" 2,1x107‘M {$0.090 3E d) 5.3x10'5M [M 30 if] e) 1.0x10‘3M I7, Coal gasification can be represemed by the equation: a 20m + 21-120“) —» 0mm) + com Use the following information to find AH for the above reacfion: ’,’/[email protected]) +‘ Hug) *9 C0} + H20(g) AH=-l31kJ @ .COfg) ‘5' [1203] —’ C02“) + Hza) AH=41U Q COCK) + 3H2(g) :__CI'¥4(E)\ + H20“) AH=-206kj @ /fi/ 13) 116 k] c) +116kJ @{3 72 1d / "" e) —15 k1 l8. 19. Acetylene torches utilize the following reaction' 2C3Hgm) + 502(5) “' 4COZ® '1" EH20”) Use the following standard enthalpies of formation to calculate AH" for this g-r - reaction. 6/ ‘ Czflz (3) AHI'o 2 226.7 kl / 1110] { com) AHiP=-393.5 kJ/mol <“&Q\:‘ *1 \. H20® AHf° = -24 l .5 k] f 11101 6/11,,“ Ogfifl ~ L a) 2511M “(11“ ?x Q9 P- D 6 x; b) 408.6 k} “a, ,x ‘d c) 403 6 k] ALI) R L} Q —2511 1d ,1, I 9» e) None of these is correct. Consider the following information: H'WCEC—FH (g) + 2H2“) —’ HaC—CHHQ l BEforC—C=350.kI/mol ’LBEforH—H=435 U a} x (:C What is the estimated value for the bond dissociation energy for the carbon to carbon ple bond? 1050.1{meol AMY! n g: " b) 833 kJ/tnol ® ? MW 1 d) 397 kJ {mol LBEforC—H=4lO.kJ/mol Cw “LOO- e) 8841d/‘mol (“Oi-4030* ...
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