Exam II CHM 331- key(done) - November 7, 2006 Time: 50 min...

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Unformatted text preview: November 7, 2006 Time: 50 min Dr. Eumean CHM 33} -. \, Name ~~~~~~~~~~~~~~~~~~~~~ n «M n» - 33..-----__._--------__--_----- ___- ----- - Total Points: 100 Equation sheet provided. R= 3.314 JK“ mor‘. Fm 96500 Couiomb g = 9.8 msa. L m 6.023 x 1023 1. ( 18 points) a) (10 points) The conductivity (1c) of a saturated solution of silver chioride at 25°C is 1.55 x 10“6 s cm" and that ofttie water used is 4.30 x 10 *7 s cm". In a fietd of 2.00 V cm“, the velocities of Ag+ and CI” ions are 1.10 x 10’3 and 1.32 x 10'3- cm s“, respectivoiy. Calculate the Km of AgCl neglecting activity coefficient ,4 ‘” 2.00 ’1' at S‘ V [(15 ,.. 1-11-va3 5; {Jim W ’- M, as Z ' “1 4w”) figg-flm[[(f‘f ) “I /\ ‘3» “ '" w (16-? who“ 5 A; fl, 3 “6.1”;- [SS'XtdtmgsoilS .S 5 ,6 5 5 q-S7¥!;?€”°l W3): V—Tgifl’ Mal/Lidia’s x” 522.0“?! ' km” $1" 1Q~Ych ) -- b) (8 points) A current of 2.00 A is aptiiied to a metal wire for 30 s. (i) (4 points) How many oiectrons pass through a given point in the wire during this time? @g—(‘fzz-JBigO—fwgoc gig“ £9, 5‘, 5(22 naqfiqdwfi M4144!“ -‘ W M 75"" ... .4“ o f/4dl‘thm’l 6-22)“? {Namath 3 i (ii) (4 points) Ifthe same current is passed through a cell containing C3504 solution, how many grams Cu will be deposited at the cathode? (Atomic mass of (311m 63.5) -- . La CA1? +«1g p9- . 0/2.)” w IForcv/7 “WM Wf “#2:” j "1 a t f 7K .- 5-21)“; FMM H r t...— o~°fi4 j“ “.22: v\<* I'll-I- 2. (18 points) a) (12 points) 'Z‘he viscosities reiative to pure sokvent of a fraction of polystyrene dissoived in benzene at 20°C were: 0.10 1.59 0.01 1.05 0.050 1.28 Concentration (g poiystyrene/ 100 g solvent) 13019 From a suitabie graph, find the intrinsic viscosity, [n], of poiystyrene. 7—! as 1 I Z I h . I II_I-III- II-I-III- I-I-II— b) (6 points) It was shown in 01383 that the veiecity (v) of a cykindrical quuid 1ayer of radius :- flowing through a tube of radius R and iength L is given by: w (Pp P2) (R2~r2)f4n{. where P; and P2 are the end pressures. Show that the voiume V flowing through the tube per unit time is given by: awe: 2 (Pp ?2)1rR4ISnL 4; n4 Via—i av:- 1 10, Wjfiflnflrr’QGQM/L) In W Emmerwm’” ’9‘ 3. (28 points) Suppoée that a proteén molecule has a radius of {0'8 m and a density of 1.15g $1116, and is in water at 20"C. At 20°C, the Viscosity of water is 1.002 x 10'3 kg 31"} s and its density is 0.997 g em'3 . a) (18 points)Assuming the moiecule has a perfectiy spherical} shape, . caicuiate the diffusion and sedimentation coefficients. r {I f" 2: £3“ ” sifsm mm 3 ikzjymo (mi 597417 51.12,)(5YK6'6‘Z‘V‘0 )(I-{bbiio :1 :cc 771;!” mm? W gfs’f Cry M) #‘g 3 6 13(7023 f-‘{ {‘0’} .. x '0 M c if; "’“*"Q") 737/ r . 4' £736" 5 A ,D (,w 1/52) M , z,:ww><(’”fl-LJ / WW W . a" F 53 541912“; (x :3 3 { 33 X‘ g (5" 5‘ b) (18 points) flow far wouid the moi ' ' e minute If it were 3 in an uitracennifuge, 20 cm from the axis of rotation, with a revolution speed of 20,000 rpm? Lf x/0 3:" 7!: v:- /"’é 5, ,3 M I m;n«/€,W4“"‘ “"fl ,- g‘BK‘OW 4. (24 points) For a 'I—dimensional gas we have shown in ciass that the veiocity distribution fimction is given by: f(u) = K exp(»mu2f2kT) (in on Show that K m (um/21m)"; "* - up (Haifa 7:1,; Kg“ u. r L, r~€~ K” mi Obtain by integration and expression for the foot mean square velocity of molecuios thaz travei in the +2: direction only. ,ynu‘ "2:7 W )1 p we Avg!“ ‘3: M V 24211? O i 3 i w ”“ )a, . fl “3 I zfit’T Ll m c) Caicuiate the probabiiity that a nitrogen moiecuie traveiing at 300K in the x~direction win have a veiocity between 99.5 and £005 :21 sd? *3 ‘1! g , .4wa X10 “‘- /D Z nymmflw . L/ Lg" a»/00 m5”? J 2133 “9 M ’ ,w {.0 m 5 9 I” ’1 Au I, . .31 )(13 p‘iviooifl/r / / Z ...
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This note was uploaded on 12/17/2011 for the course CHEMICAL E 304 taught by Professor Darwish during the Spring '11 term at American University of Sharjah.

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Exam II CHM 331- key(done) - November 7, 2006 Time: 50 min...

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