Previous Test 4

Previous Test 4 - MULTIPLE CHOICE. Choose the one...

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MULTIPLE CHOICE. Choose the one alternative that bestcompletes the statement or answers the question. 1) Whatmass ofsilvercan be plated onto an objectin 33.5 minutes at 8.7 A of current? I} G Q, --lr/ I nO~ 2,;2 ;5Y~11f\V\ ,~,"", . tol:'Q~ Ag+(aq) + e- - Ag(s) 'Q. ..:.I . .'::!:!-. . -'.) .. ,- ~"" .~'~~ '" - z \~ ctl. .Dl. .\~<;}6 \'t't'~Ht_ A) 0.326 g B) 9.78 g q 19.6 g D) 0.102 g E) 3.07 g 2) ... B &Calcu1ate AG at298 K under the conditions shown below for the following reaction. rxn \7.· M \l~-"""'~ AGO = -28.0 kJ Fe203(s) + 3CO(g) - 2 Fe(s) + 3 C02(g) " P(CO) = 1.4 atm, P(C02) = 2.1atm E) +31.0k} A) -30.7kJ B) -25.0kJ q +17.5kJ D} +299k} 3)A 3) Determine the molar solubilityof Fe(OH)2inpurewater. .Ksp(Fe(OHh) = 4.87 x 10- 17 . I A) 2.30 x 10-6 M B) 1.62 x 10- 17 M f.-.) ;;:'-~" ( Q\l . :=j,. " J .-: \:- --/ '! . ." ;··f (" z.. '_' q 3.65 D) 2.44 x 10- 6 M x 10- 17 M <,,":) ", ,J :::. LJ \, ' _,~ ,!' ;,')_"1 V() 7 y. \ V \>,i;J-.(.k ; d:~' E) 4.03 x 10- 9 M ~ ~~,;Z.~~ff;.'~ " ~(-\. '", tl-z S.'tf I v- i 1 4) Use the tabulated half-cell potentials to calculate AGofor the following balanced redox reaction. '.:'!, X 4 ) ac P!J2+(aq) + Cu(s} - Pb(s)+ Cu 2 +(aq) , A) -21 kJ B) -41kJ C) +91kJ D) +46kJ E) -o.47kJ 5) A solution contains 0.036 M cu2+ and 0.044 M Fe2+. A solution containing sulfide ions is added to "'5) ~ selectivelyprecipitate oneofthemetalions from solution. Atwhatconcentration ofsulfideion will a precipitate begin to form? What is theidentityofthe precipitate? Ksp(CuS} = 1.3 x 10-36, Ksp(FeS} = 6.3 x 10- 18 . ~ x 10-.35 M, FeS B)-M-x 10- 16 M, CuS q 3.6 x 10- 35 M, CuS D) 1.4 x 10- 16 M,. FeS ' ~ precipitate will form at any concentrationofsul£ide ion. B-1
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, ,'. -- 'i; "if »·,t:~:~~ -* fJJakulafe the /J.;;'::' ~.:. . fuIlowing inlonnalion. 6) G 4 HN03(g) + 5 N2H4(l) -+ 7 N2(g) + 12 H2 0 (l) AGo nm =? liHof(kJ/mol) -133.9 50.6 -285.8 '~" .• SOG/mol"K) D.. 266.9 0,.;121.2 0 . . 191.6 ·0.070.0 .. ·\o.\Z\.'''.'' 7.·.·.1.d ..• ~.· •·. )vJ: (i, l.pclj{", . " U., ;.t.-~, .t;;,;-'-{·'.'u;:" 1. ". "..,.".,.~-~ .... --- ~~>= ;.. ,. .., . \. ~ 1/ () ._ :, ~I.'~\'C"'o~~> l . 1)'.,)%''''''' A) +4 90 10 3 kJ I '\ ''(." 'C' ." .. -- \'\ 'ti"lV \. " .. .x _ t, \ ,!1i.,~, Ii t ~ '-! " .' '-~"'~>" e? .""1'~ J. ....-
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Previous Test 4 - MULTIPLE CHOICE. Choose the one...

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