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Quiz6_090108ans - QUIZ 6 Chemistry 102 version 09—01 6...

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Unformatted text preview: QUIZ 6, Chemistry 102, version 09—01 6 problems, 25 pts total, ~4.2 pts/problem For each question, select the best answer. Please remember to put answers on the bubble sheet. 1.) When is the following reaction spontaneous given the AH is'e434.6 kJ/ mol and the AS is -205.3 J other] - K"? 2Pb(s) + 02(g) “#— 2PbO(s) as e as he K? see a) This reaction is never spontaneous _ b) At temperatures higher than 2117 K a we. Meme”; Mt“ 5;» es ease Nate.) 0) At temperatures higher than 2.12 K d) At temperatures lower than 2.12 K T? Qitt‘gk 53: g4 At temperatures lower than 2117 K 2.) Calculate the equilibrium constant for the following reaction at 25 0C. AgC1(s) 1—“. Ag+(aq) + Cl'(aq) _ AG? (kt/moi) A n —109.7 77.11 ~131.2 figs“ ”Kimmie 47' w m _ W W a) 6‘8" 10 “° hem, tee-he it” {diofifif—i} ease “figs—item iggefiss‘imfi i-fi- b) 0.98 9 c) 5.6 x 10 _ Q d__ 1.04 his?» tvfiisto i ‘ __1.9:x;10'10 3.) Solve for the equilibrium partial pressure of C12 assuming x << PNOCI. Is this assumption valid if the initial pressures are PNocg = 95.6 atm and PNO = PC]; = 0 atm? ‘ 5: e3 es 3“ gNochg) 4—: .22 N0(g) + C12(g) K: = 1.13 X 10-3 1., . . Kareem ) 2 18 atm Assumption is valid 2 is?“ see. a . , MC? - w. . 3 _ b) 0.23 atrn, Assumption is valid gig“ W AM a it Lg»; 0.23 atm, Assumption is not valid ‘i ”t {if 5;} fi - .37 atrn, Assumption is valid . «fist; $34: @fi e) 1.37 atm, Assumption 15 not valid W W W a g, in? M 2“}; gym g st. fees?“ . M éésg E‘s} % {%§&%§% m gawk X: Esgqbtgfi'm 4.) 5-) 6.) ‘5: Given the following reaction and initial conditions whatiequ iii riun1 concentrations} nil-Lthe reaction comato‘lin a 0.5 L flask? 5% UL WM“ 3% \Uvm . mi Pong) $2 Pong) + 0120;) Kc =1.7s 11 Efiffimg 1.50 molam 3.00 mol 111.1 0 500 mol tea gang} 0 E "i’wfia < m 1 ’% lg g“ a)00738M ”W ‘W gfigg @0926 M 422...... c) 6.00 M d) 11.5 M e) 2.25 M 32%: ”ii Wfia 1" it “its 121i?“ wmataaa 1a new 1 Kmfifiett 0; Mae Calculate ASuniverse for the following reaction at 501 K given that AH: —65 34 98 grin.» kJ/ 11101 and AS— — -437 94 J cmol 1 0 K for the following balanced reaction. 213614160) «1 1502(g) 42> 12cc2 g) 1» 611200) as a. .2 3.) 43794311101“ . K" t1 n11.» Vfifis b) 13.5 kJ-mo1'1uK" ~2— wgflegtg 195$ .. .1... 11131111. 23 “$511“ "12.6k1-mor‘oK" fl .. K {1 Li figfl d) 424.911.111.01" . K'] it “3%”? M ‘ e) 663.5 k] omol'I IK'] fiefimw m mm a lefifigflfi‘g .5 12.1111 #«gtfifim M? 1.... @1112» Given the following two reactions LeChatelier s principle says reaction (1) will shift 111 which direction when Co2+ is added to a flask containing reaction (1) at equilibrium? (1) Fe3+(aq) + SCN‘(aq) «“1": FeSCN2+(aq) (2) C02+(aq) + SCN‘(aq) “>4— CosCN‘+(aq) a) Reaction (1) will not be affected M- Reaction‘1 U) mile“ M111 fitonards products a? 23%me 1 f3 fiéai Reaction (1) will shift towards reactants M Qt§fit 6'1 (1) Only reaction (2) will shift a) Depends on the equilibrium concentrations %% €10 eta $11.; ...
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