lc9sol - Jim Lisy m CHEM 204 Spring 2010 l Homework 0 Due...

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Unformatted text preview: Jim Lisy m CHEM 204 Spring 2010 l Homework 0 Due date: Fri Apr 2 23:00:00 2010 For the reaction Show below determine the rate law. C103“(aq) + 9 I“ (aq) + 6 H+ (aq) ~43 13' (aq) + Cl“ 4» 31—120 (1) Iodide ions can be oxidized by chlorate ions in aqueous acidic solutions. The following data were obtained: [0103-] [1—] [1%] “Timed” Rate (mol/L min) nio W 0.10 0.10 W173 x ‘ _ 10“4 x f 1336 ''''' “"m 0716 """"""" "METOMWE'EMT E 10“ “:i W mmmmmmm _"‘67§6—“‘UT6“M" “104; 10-3 3’ m 010 m """""" M“ 010 “""W'CTWMSQ—f”; it 104 Calculate the rate law for this reaction: é QZMH. rate : L: [0103-] [l [1*] D [n+1 ‘1 X011 argwggrrectu. Your receipt is lggfi554 _ _ ’ Answer a 1 for Part: [1 O 1] méwer wrifmmwwfimwmm for Part: [1 O 1] Answer 2 f ‘ Part' a 01 . [2 O 2] Jim Lisy V CHEM 204 Spring 2010 2 Homework 9 Initial rate data at 25° C are listed in the table below for the reaction: 2rq()(g)—+ (32(8) M82P9()CH(8) initial rate First determine the experimental rate law and calculate the the value of the rate constant7 k (no units). k = You are correct. Your receipt is 150—6859 Then, calculate the initial rate of this reaction, when the initial concentration of NO is 051 M and the inital eonu centration of Cl2 is 0.79 M? The units should be M/sV ...... “WANWJ You are correct. Your receipt is Answer a 2 96 fi”’ Part [2.92899408284028 wwwethWem,MWLMi ewwwwme 13 2.98816568047337] Sig o — 15 flail/31% i 0.61 {2 d1" [0.6021356616 0.6143000184] Sig 0 ~ 15 a Unit: M/s Jim Lisy — CHEM 204 Spring 2010 3 Efmw‘ffli .... WWW .................. 0W .................. ., Question 2 The following reaction: A. + 2B ->C was studied by measuring the [A] as a function of time. Be actant B was always present in excess and it was assumed that the [Bl remained essentially constant during the re action. Shown below is a table of the [A] as a function of time, in minutes. In, the first experiment, x 1.0 M and in the second experiment, [B] m 2.0 M. Also shown are the plots of these data which gave linear relationships, " w“ [B] 2 1.0 M [B] 2 2.0 M t (min) [A] (M) " [A] (MTW 10 0.477 0.408 20 “mam—“"0756 30 ” 0.431 0.224 40 0.408 0.132 J0 “” m" 0.385 “W” 0.040 W“ M5 048 I x 040 W \ 0.35 \ 0.20 0,44 m £020 0.42 0,15 049 \ m 038 v.05 {A} Wm B.00WWT"'T’T”‘ / a w 20 30 I0 50 an 70 30 40 50 64 limumin) Hmetnm) g“? i 5"" in; ,a 6 Use these data to determine the form of the rate equation for this reaction. The experimental rate equation has the form: rate : k [A]@[B} You are correct. Your receipt is 150—7651 Answer ‘ <9 0 ram Drug” Jim Lisy ~ CHEM 204 Spring 2010 4 Homework 9 For the reaction: aA —w>p1‘odncts L, that is first order in [A], decide if each of the following statements is True or False. _ Choices: True. False. g; WW" A. k decreases over time V Q l g, B. A plot of lnlAl versus time will be linear. """"" " K 2I ._ s i . I ' . i," a. ' k ‘ f V» a: M i “M. C. The rate is constant over time. -~ %; @463»va r, L. t V2 " “ ' ‘ "’“ . . in ’ D. t1/2 increases over time. w [3 t1 /2 is independent of [A]0. _ «Magi You are correct. Your receipt is 150—6856 Answer 5 False for Part: a True 0 w False 9 False «1 True A At a given temperature, N205 decomposes by a first order process, with a. half time (111/2) of 8.4 seconds. Con~ sider an experiment in which the initial concentration of N205 is 1.25 x 1016 molecules per cm3. How long is the fifth l’ialHife for this reaction? ' w s. s m:w 5 “You are correct. Your receipt is 150—8667 How long; will it take for the concentration of N205 to fall to 0.0390625 X 10316 molecules per 01113? Cm ..... __;:L.] 8 You are correct. Your receipt is 1503503 3 e Jim Lisy ~ CHEM 204 Spring 2010 5 Homework 9 Calculate the concentration of N205 after 6.4 seconds have elapse ‘. (To answer in scientific notation7 use the convention X 10”3 : 133) E WWWWWWWW M “Mm”- 1nolecu les / C1113 Ywmfirufiieieww .................... m f¥3¥frV_ » 8.40 or art‘ [798 11 8.82] Sig o — 15 finsvxgn > m 42 101 all" [39.9 -3 44.1] Sig o « 15 f§5f§”1 a 7.37146631969726e+15 OI alt“ [7002893003712397 15 7740039635682123] Sig 0 ~ 15 V 5:, W) I? a?" N L; .:,,_ f; f 94;? g a m» at)», 3 . . . “ii 7% / W C WWW} é“ Calculate the rate constant (With appropriate units) for a first order reaction which is 330% complete in 315 s. ..._ You are correct. Your receipt is 1509345 What is the value of the half~life of the reaction? “WNW: You are correct. Your receipt is 15043263 How long will it take for the reaction to go to 64.5% com pletion? " wcm:::::l You are correct: Your receipt is WWWM r“Answer Q 1 ‘ 27Ew03 M fl”. Part [0.00122689774898779 11 0.00131581695956539] a Unit : s “ m 1 _ r we ~.~___=:= Answer a 5 ' 45E+02 We fin“ Part: [526.136645464054 13 564.268311455947] a Unit : 5 Answer a 8 . 15E+02 fin' Part [782.032574348292 15 847.151362053296] a Unit : s Jim Lisy w CHEM 204 Spring 2010 6 Homework 9 For the reaction: 2HOF@)fl2HF@)+OgQ d[HF]/dt : 9.8 x 10‘2 M/s at a particular temperature and set of concentrations What; are d{02]/dt and d[HOF]/dt? dbflflt:[::::::::::::] We dWONfiM:[:::::::::::j What is the rate of the reaction? C_Ww:::] You are correct. Your receipt is 1506798 Jim Lisy v- CHEM 204 Spring 2010 '7 Homework 9 For the reaction: 2oogr+ogw~+fimxw d[02]/dt : ~91 x 10“1 M/s at a particular temperature and set of concentrations. What are d[CO2]/dt and d[CO]/dt? d[COZ]/dt : TWWWUW (moi/C” : C: wwww What is the rate of the reaction? wwmi You are corregt. Your receipt _is 1502304 Answer a 4 ' 9E_O2 for Part: [004655 a 0.05145] Sig 2 m 3 a Unit: M/s Answer 9 M9 . 8E~O2 w for Part: D0093” a —0.1029] Sig 2 ~ 3 a Unit: M/s Answer WM: 4.9E_O2 m. K WV for Part: [004655 a 0.05145] Sig 2 w 3 a Unit: M/s “Answer mm. a 1.8Emoé .W __ ...... M. fin’ Part: [0.001729 b 0.001911] Sig 2 — 3 a Unit: M/s r“Anew/(EFM— m IIKW1‘8E“S;W_ a H W M M WW for Part: [‘0'001729 b “0.001911] Sig 2 w 3 a Unit: M/s Answer a 9 ‘ 1E_ 04 MM fin’ Part [0.0008645 b 0.0009555] Sig 2 M 3 e Unit: M/s The radioactive reaction: 214130 —> 210Pb + 05 is a first order reaction. The rate constant for this reaction is: 1.80 year“1 Jim Lisy ~~ CHEM 204 Spring 2010 8 Homework 9 What is the percent (01)) decay after 1.00 x 101 year? :21,“ ........... M] You are correct. Your receipt is 15094012 Calculate the time it takes till the amount of the reactant, 214130, is 15.00% from the initial amount. You are Egrrect, “Your receipt is 1502501 ___________ __ Answer a 1.00E+02 for Pam [97999998507462 a 101 . 999998446542] Sig 2 ~ 4 WA DSVVG 1‘ 5 a w for Part: [1.03287643621564- b 1075034658102] Sig 2 ~ 4. a Unit: yr The data be ow was collected for the reaction: 2N205(g) ~r 4N02ig) + 02(5) at a temperature 0 25°C: timer) macaw) ” , Using the data? Find tl/Z. L_ ______________________ j You are correct. Your receipt is 1502507 Jim Lisy — CHEM 204 Spring 2010 9 Homework 9 Plot [N205], lnlNgOS] and 1/[N205] as a function of time. You can cut and paste the data from the table into an Excell worksheet. From the graphs? determine the reaction order and the reaction rate constant. Reaction Order: Rate constant: You are correct” Your receipt is 1509837 Explanaw tion: gt l 3 l l K, g’ 1' ‘ ,1 w r __ P. “l u 3 i3? otééi l 0- %” l l a in}; l l . re 1 a l : l l "l 2 l l ml l l l i r i g i l N mmflr‘rii Only the graph of lnlA] vs. time behaves linearly, which indicates this to he a first order reaction. Answer r 7 for Part' a O. ' [5.58647584286608 a 5.80647584286608] Sig 2 ~ 3 a Unit: hr Answer g 1 for Part: IR) 99 b 1.01] Sig 1 w 15 Answer 9 1 ' 2301 for Part: [0 10068 b 0.14268] Sig 2 ~ 4 a Unit: hr“--1 Printed from LON—CAPA’IJAlSU Licensed under GNU General Public License ...
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This note was uploaded on 11/19/2010 for the course CHEM 204 taught by Professor Gruebele during the Spring '08 term at University of Illinois, Urbana Champaign.

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lc9sol - Jim Lisy m CHEM 204 Spring 2010 l Homework 0 Due...

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