1B-Quiz-2-Spring-2010333

1B-Quiz-2-Spring-2010333 - Quiz 2 Name: i Chem 1B, Spring...

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Unformatted text preview: Quiz 2 Name: i Chem 1B, Spring 10 Fossum Always show your work and explain your reasoning, include units, and check significant figures. —b:Jb2—4ac 2 x=——— ax +bx+c=0 2a 1. (9 points) For the following equilibrium: 2 N02 (g) 1—» N204 (g) KP = 6.75 at 25°C If you start with a mixture that is 0.20 atm N02 and 0.80 atm N204, a. Which way will the reaction go to reach equilibrium? Explain/ support your answer. : R1104 3 910 >K Cymbal (iii/250%? 2. :V 'V .\ Z 12%” 3.51/5 7’?) PM” (9'20) gar if? géqwltwrfW“ b. Calculate the equilibrium pressures of N02 and N204. Z M2 i 0:20 abw 0: (80555“ I; i 2%“ ____:Z<__W (3 020le wigo‘x , p : o‘zovflmw) J NoZ F :> - V (a. ow L, 7%a5lWi /' ‘, a a lxl - I a ,i -. , V?” ’ 1—~-:”"‘; (‘5?) PM“2030"'><:C3.7i5§6dwi PM; 13""in P . "\ l x “(/4 “v C ethn\ 080% -: 618% o.2m2>;3(0.20« 2%) 03 (0,304 léAx ma” MXQ $th = a}? + 64x +2.7 >9 O § ; \I 6? ~ mo 4% go ix x z (A v 1.53 my; +Q?y I C- \Q a: X : ’ if) i W4a¢ ‘ _ __('lel '7 .. 24 W“ .2: (2'?) 611‘ aft-l 2. (5 points) a. Given the reactions and corresponding equilibrium constants: Mg(OH)2(s) s Mg2+(aq) + 2 OH‘(aq) K: 1.8 x 10'11 f 2H20(.) :2 H307”) + OHM) K: 1.0 x 10'14 mm” (W: m wfirr [ Calculate the equilibrium constant for the reaction: Sawfl Mg(OH)2(S) + 2 H302”) s Mg2+(aq) + 4 H200) K: ? '2? . 4 _ . ,.’ Nflwml 1:: M3 4 20H (L: [Ewe ” MM 0045,} y L 4 / \ t N L aw" Wdi’l’lr’ifl ll 5 2&430 +26H‘ 7;? 4H»le l<= {WWW ’ H36 *2: Mill + «to \< - (9’40 : €53 X ’0‘? b. Comment on the meaning of the size of the K value you found in part a. x » r v , .’ ;{,.‘Ugm:al«t,o, ,IVWC l4 LS flus me ‘5 Vern Prgduc Moots fin , - t I r v t I (~5V1'T‘." (Mqlomz ‘3 08% Sou/LEM m (1000 5 3. (6 points) For each of the following reaction mechanisms, determine the rate law. Show your work/reasoning. Remember that intermediates must not appear in the overall rate WI law. 4 - w n ’ (. «a, .r A o 5 M k Mechanism A: P {—6 While $ f 2 NO ‘3 N202 (fast, equilibrium) ’ N202 + H2 —> N20 + H20 (slow) ' rte: ’, [MO a N20 + H2 —> N2 + H20 (fast) lg“ la 2 3' JUL] V 3 ~ at? an jg! E ask Y r but M102 is, m in4€(W(il_.—‘a:€f€, f. 1346 ’WU”& 5' v” 4' v vex Mm? nutmeg] " A. ‘92 w _ R _ _,2 (v a (Maggi; EMle 2 a 42:1 ' {a 4 SLIlOS’l‘IiUlC '7 Mechanism B: of SW NOzBr —> N02 + Br (slow) i m : “m NO P] NOzBr + Br a No2 +Br2 (fast) Q” l“ C 'L or ...
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1B-Quiz-2-Spring-2010333 - Quiz 2 Name: i Chem 1B, Spring...

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