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Practice Problem Set 1 KEY

# Practice Problem Set 1 KEY - Susie Lee Practice Problem Set...

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Unformatted text preview: Susie Lee Practice Problem Set 1 St sessions [email protected] Sun 7-8;) HECC 202 2/12/12 , Mon 7-8p HECC 202 Wed 7—8p HECC 202 I.) The vapor pressure of pure water at 25°C is 23.8torr. Determine the vapor pressure (in torr) of water at 25°C above a solution prepared by dissolving 35g of urea (a nonvolatile, non-electrolyte, MW = 60.0g/mol) in 75g of water. G ’ . P -2%.‘3 tow \$5 wet/ix slgﬂoL : 0:583 w! e mwm:3§?- so? W“ ml‘ibo :; 7901/ ‘79}; {Ave K __an_».1. : 4"”va “1.0 (7;? “3‘3 _' 141/0 446'? moi P; X P0 :(0,-‘877>(2«39> X ”t ' '5' W : 0. 977 a, 20:9 300”“ ﬁve? men 4.1m molar 0.395mdl 2.) A solution containing 10.0g of an unknown liquid and 90.0g water has a freezing point of ~2.99°C. Given Kr = ~1.86°C/n1 for water, calculate the molar mass of the unknown liquid. / : m mgqmﬂz {09 A it? —— K? _ . AT' - , “L We) > W o: #:3— 2 Wm : (.5032 M TW '2 ”2.01qu 1? wf‘g666/m [(43 €3.inth a .- , ‘ inbO% hm! Solid"? q i5 H 0 MM (,5le K1; , [9g 6/1“... 0.0 (a: 1, X 2 0 MW‘gquL7 (55186in x i l nwl [ 3/ .. Mmﬁaluk : 6?] ﬁfmbi 3.) Which of the following aqueous solutions has the highest osmotic pressure? a.) 0.15M KCI ( 0, H m.) c. 0.10 M Sr(N03)2 (0.! >< a) b.) 0.20M C12H22011 (0,2)“ ) @020 MNH4N03 (0"), x 2) (Moidmj x H *9 mm We‘d W m ha‘aiwt' ash/me, raw/55am. 4.) The reaction below has a rate constant of 7.93 x 10‘3 M'ls'I at a temperature of 501K. How long does it take for the concentration of N205 to drop from 0.260 M to 0.100M? 2N205(g) 94N02(g) + 02(g) il-: "(.33 Hi? M" 9'4 "Edi : iii]: + “H— Tz‘evl it __ AA “ J” [N503302-0(26 ii iii - [a] is)» .- i ”F!“ [NZ/031% " 0" M. i: Min 7&9? ‘er : “L, i’, 2 GET F OMS 2(7.Q3xlo”3) Susie Lee Practice Problem Set 1 SI sessions [email protected] Sun 7—8p HECC 202 2/12/12 . Mon 7—8p HECC 202 Wed 7-8p- HECC 202 5.) The isomerization of methyiisonitrile to acetonitrile is a i“{ order reaction. What is the half life of this reaction if k = 9.45 x 10'5 3'1? ,6 _7 mini—~— ‘(2 ’ [Me ‘ Me” (i)( 4.43 Kid—59f 3 7922‘; 51" 6.) Hydrogen peroxide decomposes in a dilute sodium hydroxide solution as shown in the reaction below. What is the concentration of the peroxide after 100. min if the initial concentration of H202 is 0.020M and k = 1.06 x 10'3 min"? H202(aq) -> H200) + 1/202(g) 't: {00 min LHVODJD 2 Or 02. M ' “RM i!”- {Eoéx in”? Win" Div/02,130: [(Awoqu C 7 ,3 ‘4! — ~(i3(i.ubxro mm ﬂwvmn) [“39wa '7'? 2 (0. 02 M) Q, 2 some M 7.) At temperatures ﬂimiW than 9% @ﬂthe following reaction is spontaneous under standard conditions. C(s) + H20(g) a CO(g) + H2(g) AH° = 131.3 kJ/mol AS" = 133.6 J/K La one; ins/n AG -, 1314 w T03 Win 06:0 0 t: 03H , “(as on T : ~—-» 05 mutt/J11: z 0,83 IL. Susie Lee Practice Problem Set 1 SI sessions Susie.|[email protected] Sun 7-8p HECC 202 2/12/12 ‘ Mon 7-8p HECC 202 Wed 7-8p HECC 202 8.) Calculate the A5“ of the following reaction at room temperature. NH3(g) + HN03(aq) 9 NH4N03(aq) - Thermodynamic Values AHO (kl/moi) 235° (J/mol) NH3(g) 45.90 192.77 HN03(aq) -207.35 146.4 NH4N03(aq) -339.87 259.8 . . u _ -—-| "a A, As hm' 2" 08 WW“ " 2‘- A\$wattanit< .5 35:63.2 .J/M , [ 142-77 J/w; ~r i464 J/MJ "a '- "79:37 J/Vhol 9.) The data in the table below were obtained for the reaction below. What is the rate law equation for this reaction? Calculate the rate constant for this reaction as well. Inltlal rate 5 0 02480 0 00276 0.00828 6) 0.025”;0 15L0,003XC0,§J? 6) 0.021?th : k£0t06 ]"‘ [0‘81], .65) 1 0-30176 : ;[o.0?.j”[ ‘03)? @ 0 00276 1: k [0.0ij L0.0}JY q‘ 3% (3 OIWWQ ~ i: [0.013% [00‘le x21 /, (95 o oil/(€90 ' ié [0 06370.92? % _ o 0082.8 1 [(0.02] lioﬂl/ K“ 220 W113i“ 0, 00376 ﬁozjw[olo'§3/ Raﬁ 2 2770 [moi-13mm] 3 = 3" «a 3’24 10.) A particular reaction has a rate constant of 1.35 x 1025'1 at 25°C. W/hat'is the mag 'tude of k at 95°C if the activation energy for the Wlﬂmol? / ...
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