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Test_chem110a_f04_mt_01

Test_chem110a_f04_mt_01 - CHEMISTRY 110A INSTR R.N SCHWARTZ...

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Unformatted text preview: CHEMISTRY 110A INSTR: R.N. SCHWARTZ MIDTERM EXAM #1 Friday, October 29, 2004 NAME: Tongc l’xoiuang I Nicholas. SID # W— (last) b (first) Instructions: 1. This exam consists of 3 questions. Before starting, write your name on every page. 2. Indicate answers, including units, and show your method of calculation and reasoning. 3. No credit will be given for an answer alone or for an illegible answer. 4. Use the conventions for significant figures and units. 5. If you run out of space working a problem, use the back of that page and indicate on the front that you have done so 6. You may use a calculator. No books or notes. 7. Useful constants and equations are on last page; you can carefully detach this page. MAKE SURE YOUR EXAM HAS 7 NUlVlBERED PAGES. CHEM 110A MIDTERM #1 ' 29 October 2004 NAME: W "t 3"“ '93 i L, l. (40 points) One mole of an ideal gas at a pressure of 1 bar undergoes a reversible isothermal change at 300 K that doubles its volume VI = 2%. Assume the gas is composed of diatomic molecules. a. Calculate q, w, AU, AH , and AS. , g r ‘1: f a Q J T‘ Q . : ‘ ‘V' :35er (na\ OM :: O (“o/\fi‘l' T J ‘4" A / W $ 1‘ ( 23' 1 r1 ‘J-g U : ‘1‘) (1 .V\ i,.§i\t.1m::,.\~ o {‘4 3a, UJ“ -» 3‘ 5 AU ; an 2T if». TIT 0 t V! , rdU W) 1 . " m m _ fl , \ . {if ’ZV; s'i :(>))‘l d? A, (gay; ”fix; U} E. - ,i C!" rrw. ) (3. 1,4113 L.) k. ’Imr‘.) >174: 00L: ‘ ‘ka ;: v‘ > “~— Kw.....,~-..,..,..1 M W.“ . g m...“ ''''' Of 213: - in: 113T bk?” ”V cf" . w L a ,1. 3M 1;" ‘jjjggg 33:1 TAT -. U (;T P) ‘yfiimtfl" a A” T .1 ‘13" _ 1 ‘ f ., ( igi’f“mcll’?il ”/fljk Ira iii,“ iimjj) '{§r%c>J/K b. Starting from the same initial state, the gas undergoes first a reversible adiabatic change followed by an isochoric process which brings it to the same final state as in part a. i) Sketch and label a diagram in P-V state space showing the various steps connecting the initial and final state of the system. .9 1 (317% “’1‘ " CHEM 110A MIDTERM #1 ' 29 October 2004 NAMEz’Jmamwci aiaj ii) Calculate q, w, AU , AH , and AS for each process in b. i ‘7‘ Ac"’n't«o‘“ir r"rn~3vft7‘hw? rr urge if”. warm-f c, x . , _ V W1C)! rmc: 1-. E) :‘N‘ ”x, V In,” x U: U (__ 3A), , 7' U v. M ".1”;. d *3 V A f at! " {fl ’1' \ ”1 I) (> .- ~ 7' [K r a.) < [a » er’m’fi’t 10". 2 (15...,5 I g V L [’0' /‘ (21”.? ,4», {If- Ranlk I M ~ij { ........................ La} - =SIOI/ \w» 457;?) Mm ,1) p ”WW K V‘ M». .~_, u. "m l»rvn-- » ,. ‘f 3 ‘ _ . ‘fl A f“ ’ V‘ r: >7 g “:54: , a V 1 1” I I ’ . .\ K M .— m? bL‘ P‘ 'r Edi: .‘\(f.r,’r ‘ t v l00flh'(:‘:}\)‘€' .rrgrl "I." / J ‘ (”\P‘ x .. \ . 1 , f ! > ’ y« I L” ) 7:"41}. r‘wcl/‘Qflr 15‘ Ir , a F {T/‘cmgp ‘l‘fi font“ ,1 ,1, C3 ., , 3 , .. CHEM 110A MIDTERM #1 29 October 2004 NAME: ”r3: ,1», 5-}. ‘ . 2. (30 points) This problem deals with a van der Waals gas: 3. Find an ex ' n for the work assuming the gas undergoes a reversible isothermal 3‘. a my ". y‘ A! a. ”f ‘3 U :3 (1 a“: . .: ‘ 3:1 :3... : : ~ an :" 5 j ‘ l "0‘! 2- \‘fl‘ ‘1 ”1""! is" ’3 A «I f it“, ‘. ‘ : W a) j" ":3" HT 7‘ l ‘I " x, ‘ 131-71 "V N“) . 2: ~ 1 . , v “”, . I“) I I (\U .. 7 1 ..._~-~ \ I NU] m '\ 1.} all " CHEM 110A MIDTERM #1 ‘ 29 October 2004 NAME: Egg—.25.. s - c. Find the differential expressions for the internal energy and the entropy of the van der- Waals gas as functions of T and V. .fi‘ v E ’ k5 ‘ )mr. ‘ “<4 \ '3' 1’ “s ‘- . “Y” . x , , r m. ‘ ‘ (“J V’ 3"" T ¥~ M. 5" V 7) L, (1“ :3? «J ~ 5:} ‘ * r ,_ ‘3 ‘ 7. Div—r 9 l “A” V . 7" ‘r J "’ 2‘) " """ f CHEM 110A MIDTERNI #1 29 October 2004 NAME: ’anhfi‘ c l 3 7 1' . 3. (30 points) The solid phase reaction shown below occurs spontaneously 1 mole X(solid phase a, — 500 C, 1 atm) —-> 1 mole X(solid phasefi, — 500 C, 1 arm) . l, , , '9 .. I X r , ' ...\ 'a r Calculate the entropy for this reaction given ngm = 5.00 JK_1mol—1 , C I? m = 4.00 JK_1mol_1 e v, and that at -25.0"C the enthalpy for the phase change a —> ,6 is -75.0 Jmol'] . Is your result in contradiction with the second law of thermodynamics? Explain (no calculations involved). m (4 ' l0 l ‘5 l A 4 r 6" (”rm/IN Vii/ArUUM-‘l / . W " , — u a ~ T , Jr y {0/ - O . a”; S L g P‘ i l / r A “ A «‘1 f k i “T I ’ b “ P "" L l; on I (3 may z’u l ’ A; 7" f" "“2 m / % >§§“ (“ML A: C ’ 1 , r G M170, fl M [if e . /j‘ Wm u x l ‘ t m x if.“ r.) , , . ‘ ‘ 0.9317 ij’kl / /’ J K “ a‘ ./ J‘l W01} ’f‘ VA” ‘65:)"; w '\ r tr“ 4 ’ V” w J lb: \ f 1 n a l : L i. 5" k (H‘: *4 t T“ ‘4“ L ’5 ii." I (U1 (“i If i ’ , W ‘ s 9 g l, 1 i . \/ J c ‘ " " a ‘1 1‘ H V N (N, I “W”; 5 l I J 'T r f” r a (Kl .i “weal-“V W W19 ‘ « L‘f/fi'” ‘ I if; f v" \ }L\ k I O / END OF THE END _ / 30 6 CHEMISTRY 110A lNSTR: R.N. SCHWARTZ MIDTERM EXAM #2 Wednesday, November 24, 2004 NAME: ”Wynne", , Naming SID # #03 .. t 0 ’ ' 55‘? (last) ‘ (first) Instructions: 1. This exam consists of 3 questions. Before Question starting, write your name on every page. 4. Indicate answers, including units, and show your method of calculation and reasoning. 3. No credit will be given for an answer alone or for an illegible answer. 4. Use the conventions for significant figures and units. 5. If you run out of space working a problem, use the back of that page and indicate on the from that you have done so 6. You may use a calculator. No books or notes. 7. Useful constants and equations are on last pages; you can carefully detach these pages. MAKE SURE YOUR EXAM HAS 9 NUMBERED PAGES. CHEM 110A MIDTERM #2 I 24 November 2004 l. (35 points) Phosgene C0C12(g) undergoes the following reaction C0C12(g) —9 C0(g) + C1269) Given the following information: K103 : 8.0x10‘9 at 100 0C and AS373K = 125.5 JK_1mol"]. 3. Calculate the equilibrium value of the extent of reaction 5a] for phosgene at lQQOC and 2 bar total pressure. Assume initially 1.00 mol of COC12( g) in the reaction vessel. b. Calculate AH €73 K for the reaction. c. If the reaction, originally in equilibrium at 100 OC and 2 bar total pressure, is suddenly perturbed by increasing the temperature (total pressure held fixed) to say 400 OC , which direction will the reaction equilibrium shift in order to relieve the temperature increase? Explain your answer. C‘F‘Cii (“q 2‘ (TM/:1, ,« in": (q l O‘l Iri'i'n" , x no 0 Q (”“wa " x .. "\c' f a 4’ . IN .. x l i l 00- f K “’1: r t. , ,c . . s t 7“. “new ' ' “2"“ _. V ’i Mgfirm ‘ l ‘A’ T‘ H» f 3.. W- _ r, , ' W255: "Pm l Z‘YL in” l“ www- : OK» M) q W” ”i o) l / l O l ~‘7 -. ‘37 ’2“ 1L ’ (aowo -<{_0wfl z a "v" 1 B 3*,0 .. PC5213 3? rfi rm 35.53 'x 0:“ ”W“ w ‘ “‘ ~ “x; lay , (QR: J 333.134" Mb] CHEM 110A MIDTERM #2 ' 24 November 2004 NAME: We» & M ‘ / n (J: - W 5 v' d) a, 2:2 ire \% mm AH Mereawi: w ‘n Mfr’ws‘”? *N‘PP‘QW“? @ OK ~13 n: raw“. AV“? ’7 ‘PC'ZL'W " ’3 C" CHElW 110A MIDTERNI #2 24 November 2004 NAME: M {cyclgwg‘TOwGr } a?” m, —————-——'—1‘— 2. (35 points) P/bar ._., Consider the phase diagram for single component system shown below: 9O liquid 60 30 100 400 800 1200 1600 T/K where Solid ,8 and Solid a refer to solid phasesa and fl . a. What are the values of f (degrees of freedom) at the points 1, 2, 3, and 4 indicated in the phase diagram above. b. Sketch and label a plot of y vs T for P = 80 bar. c. Sketch and label a plot of y vs P for T: 850 K. d. What can you say about the density pa of the solid phase a compared to the density of the m GQ'OK liquid phase pl.“ Explain your reasoning. FAN A3 5.20%}? L1 A! W (/0, ;. ,2 g 2-. , r ' 1. If f m. r- . . s {43? {Jain ,u l “ELMW .» 711 ” AA "M O 51‘: 1‘“ ‘H: a M at l ‘ Mr 1! i V: op @ , " / ”f M" P “’m ” (T) x '5' Mi 2.. ‘ K .— l : J? m.»- 6’" “:5 B 7 e f " 1/ fl 12:14., L M V\ m \l‘“ M / UV ‘4 4 3,, jflrcxric,39(3,,\c« w ‘ CHEM 110A MIDTERM #2 ' 24 November 2004 (’3 a 1 ‘1 I m 1-,, r * a ,M \M '3 . m ’ ’ M 4m ' 1 1 OK» (I t:- 4- st t- ‘f V ’3‘ r «3’ {220,036, It I x” x H *b 4‘ ,\ ‘r- firnpgjm 3, J , r V p , ’ 4 ~ ’* I”) 1’ " ‘“ W ’ w “I‘m-i MN» mt, CJM Swap. 1) i , ,. 1(r m we . , ,w a . {a w A (H {i w W I ' ' “(31, ‘ I? 1‘ CHEM 110A MIDTERM #2 L 24 November 2004 NAME: 3. (3019017115) A gas obeys the equation of state: P Vm 2 RT + bP , where b is a constant. If the gas expands from Vm] to Vm 2 reversibly at constant T, gerive expressions for AAm, ASm and AGm. 7 a mv‘l Express final answers in terms of R, T , Vm 1, and ij. Show all steps to receive credit. yer l2“ 4’ l: c; . A rn ‘ /\ r4 '6] \ ' F' c; 43.1 :W t _ rm OK“ Tfivll‘ar/vélv P‘ \IWL: C0“ QM; \ g, 4 '\f~¥~'-»~; . [flit : .5; 6V 1;: J}; Pa“, in?! ax; { 61 [IV ‘\ ”fi— 63?)? 7 ”E3 NW1 Ll ' I ' t” H l« l \ "‘2?- " é-" \‘V'I L 4V -KKOA \[mzr’bvl IO/I/p vm,‘ ' L (“NV / ll ,~ (L) \j 2 7715‘}, l, (:3? T l M r grit was; . E: T . $6 1/ J; i§_1'7’flw x" f , 'Vl‘ 7! k/lfl A ’Hv‘ M...» .......... W V: , l, J/ ’. £ , all?” WW an“. /'7 m» I * : bAp-n CF 3) WKT» k l. \Im ’r l CHEM 110A MIDTERM #2 24 November 2004 NAME: END OF THE END ...
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