chm2exam4 - CHM2046 I Exam 4 Fa112009 Name,-~-cJ., Choose t...

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CHM2046 Exam 4 Fa112009 I Name cJ. .., ,----------------~~--- Choose the one alternative that best completes the statement or answers the question. 1) Which of the following quantities has a value of zero in the standard state? G~ II) 4,Gof ill) So /?"-- ~only \: B) (onlG \C) I and II /0)illOnly '~w_--<_ '" 2) Which of the s~_ecies in the following electrochemical reaction is oxidized? OTL ~'RTb ~ - ,,'"") ~ ('j o -.~ ;:;."" Mg~ + Cu 2 + (aq) -+ Mg2+ (aq) + Cu (5) "AI"'. \ 11"'9-i C> ~- \ I (' ;)'rk~ ~ I ..; _ \ v""", ,\.,.A" \)U I '~~ . '-"", A) Mg2+ (aq) B) Cu '(s)~' C) Cu 2 + (aq) 0) Mg (5) Table 1 Selected Standard Electrode Potentials at 25°C ''') "" (.', J\ Reaction EO, V f '''~ '? Mg2+ (aq) + 2 e- -+ Mg (5) -2.356 Fe 2 + (aq) + 2 e- Fe (5) -0,440 Pb 2 + (aq) + 2e- Pb(s) -0.125 2 H+ (aq) + 2 e- -+ H2 (g) 0.0 Cu 2 + (aq) + 2 Cu (5) +0.337 12 (5) + 2 e- 21- (5) +0.535 c-Je 3 +)aq) + 2 e- Fe 2 + (aq) +0.771 Ag+ (aq) + e- Ag (5) +0.800 02 (g) + 4 H+ (aq) + 2 e- 2 H2O +1.229 Cl2 (g) + 2 2 Cl- (aq) -1,35 +1.358 - '.' ; F2 (g) + 2 e- 2 F- (aq) +2,866 /' 3) (Refer to Table 1) Calculate the value of L>Go for the following reaction, in kJ. (~._>+.~ ~j ",;h', u 6(; ,: n, Cl2 (g) + 2 (aq) 2 (aq) + F2 (g) "'\, e; . ..Q.:.;;! r) I '"'\ 0 ~ ip /\~ '-'-. .t "'" ~. A) +291 8) -291 C) -145 150 E) +145 .1- - " j . . . . " r-, ,;. .' c:"- . .ak. l_' ,.~ ~ I .~.~ .. t..~ . . . . . _.J "'";"',1. ,.. ~ ~_,·-t,.-~::::,! ""\~~'1 I "I t-., ~~ ~ ~ ~~1J\O 1/ A-I
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4) (Refer to Table 1) Will the following reaction occur spontaneously as written? if'" -. . 'J C '':.,"e~A,.\ ~ -r A'" .:. ../~~ Cl2 (g) + Fe (s) -. . 2 Cl- (ag) + Fe 2 + (ag) ..- 1 ,-:::"'J , ' l4 .LV':::; , ; ':l;; ";i't', . /'~. A)ye~ B) no C) impossible to tell -~ 5} (Refer to Table 1) Which of the following will reduce Fe 3 + to Fe 2 + but not H+ to H2 (g)? C"--""" A) CI- ~ Cu' C) Mg D) Fe E) Ag ----. ../ 6) (Refer to Table 1) How many metals listed will react with aq HC] with evolution of hyd~.,~s' A) 0 B) 1 C) 2 .12) 3 ' - ______ dO 7) If ~GO for a reaction is gtater than zero, then _____ A) K> 1 B) K = 1 C) K 0 ('"D) K< J. ,,-c. ....... ~.~ 8) Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C EOcell "'" , ,'. $'')od -:'1 0.94 V r:.""', gL.-i - \".12::::. . ) 00 (Q " . ('r , Sn(s) I Sn2+(aq, 0.022 M) Ii Ag1'(aq, 2.7 M) ! Ag(s) / '. . ,,': ,----- A) -0.66 V B) +0.01 V (' q +1.02 V/ ~-~ .•. . ~ '"' \ \ {! /1 .' ''1'"; \ - "j ("~~~ "'.'. "r -_-f.,~ ~'~.,."", 9} How many electrons are transferred in the following reaction? " _ ~ Br:(ag) ~ Crz072- (ag) +Gl,'H+ (aq) -. . 2 cr3+ (ag) + 7 H20 + 3 Brz (I) ,e. . -.\- lobr -,~~ j'P(~ '< , .. \ , .. \. -,.,,, C'J 0 ""- ~ .• \-\ -- 0: \". ( , ), ,I \:' A) 1 ;). ., B} 2 Cl 3 D) 6 r E) 14 10) The standard Gibbs free energy of formation of __ ~,_ is zero. .22.Ji2S?JI) (>(b) ° (g) . '" ~L_l!~~ A) (a) only B) (b) only C) (c) only D) '(b) and (c) 11) Determine the equilibrium constant for the following reaction at 298 K S03(g) + H20(g) -. . H2S04(l) !lGO -90.5 kJ A) 9.11 )( 10- 8 ~)' 7.31)( C) 1.37 ~ 16 D) 4.78 )( 1011 E) 0.964
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This note was uploaded on 07/28/2010 for the course CHM 2046 taught by Professor Dixon during the Fall '08 term at University of Central Florida.

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chm2exam4 - CHM2046 I Exam 4 Fa112009 Name,-~-cJ., Choose t...

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