Ex 2 Sp05 - k 3% mama We 4’ Xe Wm“ WW I CHM 2046 EXAM...

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Unformatted text preview: k 3% mama We 4’ Xe Wm“ WW I CHM 2046 EXAM 2, FORM CODE A Mar. 9, 2005 Please bubble in A as the test Form Code at the top right ofyour answer sheet. Failure to do this will result in a. penalty oflO points. 1. In the equation for the chemical reaction at 25 DC which corresponds to AC? for ir0n(11) sulfate, the total number of moles of solid—phase reactants is (1)4 (2) 5/3 @9/8 (4) 7/2 (5) 6. I liFor the following listed systems at 25 °C, CaSO4-2H20(s) should be least stable in 1 1 M 1115230., (2) pure water W001 M “H3003” (4) 0.5 M (15(31-2 5) 1 M NH4H003 . For H20(s) fi H200) at 0 °C, 1 atm, AG? 1120(1) > so; 53(5) 141311200) s VP 1120(5) >QZ/AGE is — ( ~ 1 (4) AH.1s-.ASriS- 5 AH"S+‘AS”S+‘ 3W1. For: 03804-211206) + 2 HF(a.q) 4:“ CeF2(s) + H30+(a.q) + HOSOa_(aq) + 1120(1), K is closes to 3.1mm4 Mum-5 (3) 720 8.5 (5) 0.44. 5. Cousider: 2 N02 (g) # N204 (g). If this EQ is established at Pm, = 1.1 atm and P(N02}EQ = 0.44 atm, after starting with a mixture of 1.0 111015 N02 and 1.5 inols N204. the quantity of N204 present at EQ will be closest to @1.5 mols (2) 2.1 mols (3) 1.2 111013 (4) 0.90 111015 (5) 1.9 mols. 6. Consider: 02(g) 1=‘ 2 C(13) which is established at std-state conditions at a. T of 4256 K. lf 5" 02(g) = 205.1 J/moflnd 3° 0(g) = 161.5 J/mol K, AH? for ()(g) is closest to (1) 101 kJ/moi 2 49 kJ/mol (3) 41.35 kJ/mol (4) 412.714.1/11151 (5) -194kJ/rnol. a 7(The following reaction which, on a “per mole of reaction basis”, has the greatest entlialpic drive at 150 °C is 2(4) + 1/2 0414) —> H2014) g) + 1/2 0413) —> H200) H2(g) + 1/3 03(s) —> H20(s) 11(g) + 0(g) 4-4 1120(g) 2 H2(g) + 2 0(g) —1 2 1120(4). EEK «J, 1 8. If, in aqueous (HO)2S()2 (H2804) solution, [1130+] is 7(3042'], M, (110)2302 is Closest to (1) 0.027 M (2) 0.0060 M @051 M (4) 0.012 M (5) 0.0072 M. 9. For methyl trichloromethyl ether, H3COCClg. the average oxidation state (same as oxidation number) for C is (1) +2 (2) 0 (3) —2 (4) —1/2 @1. l10.lThe following listed m rial which can be made as a pure substance is 1 (NH4i20 MGZOHzlsFa MAHOHeMCOm Muonztwcom 11. For: F8304(S) + CO(gj —> 3 FeO(s) + 002(g), AH, = +220 kJ. For: Fe(s) + 002(g) —> FeO(s) + 00(g), AH, : —11.0 kJ. For: Fe203(s) + 3 CO(g)—-> 2 Fe(s) + 3 C02(g), AH, 2 +205 14.]. Based on these data, for: 3 Fe203(s) + 00(5) —1 2 Fe304(s) + C02(g), AH, is closest to (1) 42.0111 (2) —39.5 k1 (3) 39.5 1o —4s.5 1:1 (5) 34.5 k1. li‘2. lThe following listed solution which has a pH closest to 7.0 is (1) 1M NH4CN @ 1M NH:ch 0.5 M Al2(SO,;)3 % ><1(1—6 M NaOl—I [HAc] 2 [Ac‘] : .3. dos—Y Fae S?o§ 0% 111-1! @Indicator HIV is yellow (Y) at pH 2.4 or less, green (G) at pH 3.1, and blue (B) at pH 4.2 or above. So, if 250 mL of 0.4 M HZ is treated with a drop of this indicator to give a color in the GB range, regarding HIV and HZ as B/L acids it follows that (1) HZ is certainly stronger HZ is likely stronger (3) these acids are about equal strength HIV is certainly stronger MHIV is likely stronger. 14. The following listed mixture which provides the best chance to precipitate MX2(s) is 1 M M012 w. 0.1 M NaX (2) 0.5 M MCI; w. 0.5 M NaX 0.3 M MCI2 w. 0.7 M NaX (4) 0.1M MCI2 w. 1 M NaX (5) 0.7 M M012 w. 0.3 M NaX. a If, in a buffered, saturated, aqueous soln of 03003, it is found that [Ca2+] and 01000;") are essentially e 1131, the soln h‘ _- be‘ 1 buffered 'n a H range th' t. is sest to ,- r ) (1) 6.0 - 7.0 @811 - 9.0 We - 8.0 We -10.0 10.0 — 11.0. 1::l< 16. Consider: Ag20(s) -+ 2 Ag(s) + 1/2 02(g). This reaction comes to EQ at 25 °C with K = 3.6 >< 10‘6 atm‘fl. Based on this, if excess AggO(s) decomposes at 25 °C until EC.) is achieved in a 1.0 x 1010 L room that is initially void of atmospheric oxygen, the quantity of 03(g) produced will be closest to (l) 2.1 x 109 mols (2) 13 molecules ( (3) 0.00531nols (4) 9.2 x 1032 mols l' (5) 0.75 mols. (17.1 The following transformation which is thermodynamically easiest to achieve (i.e., can 0 to a large extent) under usual conditions in CLB C130 (our lecture auditorium) is f “(‘11 02511) —+ Hls) + 0H(sl (2) H200} —> H2115) +1/2 020%) 3) 20(1) —> Hiois) , F 5 2 H200) r—> H30+(aq) + HO_(aq) Eli-{.1 , H2001 —) H2018) - 18. a buffer solution is prepared by mixing 25.0 mL of 0.84 M NH4CI with 30.0 IIIL of 0.70 M NH;, and 0.014 mols HCl(g) is bubbled into this buffer, [1130+] will increase by a factor which is closest to (1) 2 @35 (3) 3 (4) 4 (5) e. 19. Of the following listed solutions, a large—extent B/L A/B reaction will occur on mixing 1 M NH4HS with 1) .5 M (NI—102304 (2) 1 M 013.0103 @05 M A1013 (4) pure water 1 M KHCOg. 20. Consider mixing 0.030 mol AgCl with 1.0 L of an aqueous N113 soln to establish: AgCl(s) + 2 NH3(aq) \——‘ Ag(NH3)2+(aq) + C1_(aq); for which X is 0.0020. Thus, if for this system at EQ, 1"] = 0.020, M? for the I‘ll-13 soln was closest to , (l) 1.2 M 0.41 M (3) 1.4 M (4) 0.055 M (5) 0.83 M. {21' If a soln is prepared by mixing 80.0 mL of 0.25 M NH4Cl with 20.0 mL of 1.2 M NH3, and 0.11 mols K2 (3) i d15301V d in is soln, [ 0‘ n the resin ing 11 will be closest to 5K1 I) .0 M 1.0 M 0.75 M 0.040 M 0020 M. " L) " a. pagan»? , 22. On making the fo lowing mixtures, the largest extent B /L A/ B reaction involv‘hg principal solute species will occur in (1) 1M HF with 0.1 M NaHS (2) 1 M A1(N03)3 with 0.05 M K2003 (3) 0.1 M HA0 with 1 M KF 4 0.5 M HOCl with 0.5 M KAc 0.5 M NH4HSO4 with 0.2 M NagO . 23. Consider: Ca(OH)2(s) + 2 NH4+(aq) as Ca2+(aq) + 2 NH3(aq) + 2 1120(1); for which K = 9.3 x 10“. Based on this, i110 mols (511(01-1); is treated with 50.0 mL of 2.0 M’ N114Cl, _ the antity of Ca( )2 which will be dissolved is closes o ( 0.10 mols 0.20 mols 50 mols 0.025 mols Murals. 24 or: CaCO;;(s) + “HZCO3"(aq) + 5042_(aq) + 2 H20 )2‘ CaSO4-2H20(s) + 2 HC()3‘(aq), K = 4.5. So, if 1.0 mols CaCO3(s) is shaken in a soln of [8042—]; = [“HgCOg"]i = 0.020, and the syst m volume is 1.0 L, he [HCOa‘hg which results is closest to (1) 1.0 M >4< 0.020 M 7(0040 M .010 M (5) 0.060 119‘. r r >4 ’1‘ L: a K 1. ...
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This note was uploaded on 07/22/2008 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Ex 2 Sp05 - k 3% mama We 4’ Xe Wm“ WW I CHM 2046 EXAM...

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