chem_1008_pactice1__keyb_

chem_1008_pactice1__keyb_ - CHEMISTRY 1008 Optional Review...

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Unformatted text preview: CHEMISTRY 1008 Optional Review Questions for Prelim l 1. A combustion reaction releases 10.34 kJ of heat. This heat is absorbed by the surrounding 21.5 grams of ice, bringing the H20 to a final temperature of 31.5 °C. What was the initial temperature of the H20? (For H20: csond=2.05 J/g°C, cliquid=4.184 J/g°C, qfusion:6.01 kJ/mol) 2. A 644 I change in internal energy of a sample of solid CO; at -78.0°C is caused by sublimation and raising the temperature to 65 .O°C under constant pressure. Calculate the mass of the sample of C02, the change in enthalpy, and the work done. (For C02: cgas=0.850 J/g°C, qsublimafion=7 .96 kJ/mol) au=éw '3' =4, +w ‘ ' ’ : u . . ~---- 9 x" W --,-:.. «rpa V A u ‘L Suwmfim {w ) 1. U 3. An average city with a population of 100,000 people will use about 1.0x10ll k] of energy each day. Assume all of that energy is derived from the combustion of octane, Cngs (1), to form C02 (g) and H20 (g). Using the enthalpy changes for the reactions below, calculate how much octane (in kilograms) would be used by the city of Ithaca (population 30,000) each day. 8C (3, graphite) + 9 H2 (g) -> Cngg (t) AH° = -250.1 kJ/mol C (s, graphite) + 02 (g) -—> C02 (g) AH° = -393.5 kJ/mol 1/2 02 (g) + H2 (g) "3' H20 (5) AH0 = -285.8 kJ/mol H20 (1) —9 H20 (g) AH° = 44.0 kJ/mol I a c f0 i: P _ c - .15 (_ “495(6) (9) +7I£Q(¢J) A! not) , 'l’arycl' KueTfln ’ (’b' “Ilia: a; C J) A “f « "'i’ z o: ~— -—25’o.r K - +£30.11“ AW): 9 (’3‘735310': 3N8 KT A H0; W415,” Ky) e: #1371.) \(5 i .. AH": ‘7 (qq‘OKj') 1: + 376,» KT out-AMW‘. Aunt-g!” «Nu map" can ado-“p.73: ‘3‘“! '- l~w41n~uhh .; 1- 0' Wm‘yhfltwuqukwngbflmman WM ‘8” “1—. C8 [1% 1% (43‘) --> C0113) r 71’1061') \J\J 4. At 701 K, the rate constant for the following reaction was determined to be 2.57 M 13'], and the activation energy for the reaction was 145 kJ/mol. N02 (g) + CO (g) —-> NO (g) + C02 (g) (a) Assuming Arrhenius behavior, what is the rate constant for the reaction run at 895 K? (b) What is the activation energy at 653 K? (c) What is the order of the reaction? How do you know? _ , “‘1 ~I CC} must be 5&0th 9%” Luau“! /< atan cm W 5 5. The decomposition of ozone, 203 (g) —-> 302 (g), is proposed to occur in the following elementary reaction steps: k1 Step 1: 03 (g) H 02 (g) + 0 (g) fast k-l k2 Step 2: 03 (g) + 0 (g) —-> 202 (g) slow (a) Write individual expressions for the rates of each reaction (stepl forward, step 1 reverse, step 2 forward)? (b) Why can’t you express the overall reaction rate as simply the answer for step 2 (the slow step)? (c) Assuming steady state conditions, determine the expression for the rate of the overall reaction, and report the rate constant, k, for the overall reaction in terms of lg, lg, k2. (Wk: Ergo-5] 9R]? 7 rel/((36, 54‘“ : k—t 4 wk ‘1 k} [’03]be 9(0w SW3 mic = 5 {05350318 {git \\ CQianW‘ d Slip ( art. =\;\ l : k). [O'éliflfl [03] kW The following data were collected for the decomposition of N02. (a) Verify the reaction is second order with respect to [N02], by plotting the given data on the graph below. (b) What is the rate law expression for this reaction? (0) What is the reaction rate at 200 seconds? J, ' ‘ (d) What is the expression for the integrated rate law? [OH ‘* A D Em] v; 1'. M (e) At what time is 95% of N02 consumed? " ‘ ‘1'\r4$' 61 5W 7“ I'd go N02 (g) —> N0 (g) + 0 (g) . 09 {1.2.x -~\ ' Pk {xlU 3 ‘2“ a J1 ( m ) l (~03 IIEIIIMMMIIV" ; (b\ 2 ' “MM _ [00 j p '\ fawn—7% 2 IIEMIIEMMII :wm, c IIIIIIIIIIIIIIIIIIIIII'll mfloflb '”IIIIIIIIIIIIIIIIIIll-Ila- IIIIIIIIIIIIIIIIIIIIIIHII r“IIIIIIIIIIIIIIIIIIIIIIIII (£3 IIIIIIIIIIIIIIIIIIIIEIIII _ IIIIIIIIIIIIIIIIIIIEIIIII .fl,ggfi£§ “wIIIIIIIIIIIIIIIIIIEIIIIII l=ww -gw Illlllllllllllllunull-III 4 III.III-IIIIIIIIHIIIIIIII BS, III-IIIIIIIIIIIHIIIIIIIII asw :. IIIIIIIIIIIIIIKIIIIIIIIII k: 0,, 15,5141 '5“‘ IIIIIIIIIIIIIIIIIIIIIIIII ihIIIIIIIIIIIpllIIIIIIIIIII , l IIIIIIIIIIIIIIIIIIIIIIIII Mktumgg Ill-lllllplllllllllllllll ,-, m.III-llllpAll-IIIIIIIIIIII IIIIIII!‘IIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIII [pIIIII!IIIIIIIIIIIIIIIIIII IlllllIIIIIIIIIIIIIIIIIII IIIKIIIIIIIIIIIIIIIIIIIII “gIla-IIIIIIIIIIIIIIIIIIIII I!IIIIIIIIIIIIIIIIIIIIIII bEIIIIIIIIIIIIIIIIIIIIIIII iwIIIIlllllllqplllllllllyll 5,0 L’- 7‘l 86 “0 '1). do He ‘5'; I70 IS)- fiu 200 ( I, t 05' [H30 w)- ' \J" J. “ ' ,L . f .L .,.,. , F S ,5 , 1’ ' ‘~ , -\ ,- ' ' g [mgr k f [N030 0‘03 O ...
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chem_1008_pactice1__keyb_ - CHEMISTRY 1008 Optional Review...

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