ea_10616

ea_10616 - Exam II — March. 3, 2003 Chem 181 Prof. T....

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Unformatted text preview: Exam II — March. 3, 2003 Chem 181 Prof. T. Baer (Please print your name) Useful and essential information: AfHO[H20(V)] = -241.8 kJ/m AfH°[H20(£)] = —285.8 kJ/m AfH°[C02] = —393.5 kJ/m R = 0.082 L-At/mK = 8.314 J/mK P = RT/(V-b) - a/V2 PV = RT[1 + (b — a/RT)V'1 + (b/V)2 ...] w = 436de w = -nRTan2/V1 AU = q + w AH = AU + APV CP — CV = T(aP/6T)V(aV/5T)p 0L=V'1 (ray/amp KT = —V'1 (aV/aP)T p. = [6T/6P]H = [T(aV/6T)p —V]cp" dU = TdS - PdV [Tg/chv/R = VIA/2 m = (aU/aV)T = nap/am — P (6H/6P)T = -T(6V/6T)p + V dU = TdS ~PdV Chain Rule for XYZ: (metal(aw/amxwsz)Y = -l (at/(3V)S = _(aP/aS)V (at/5mg = (aV/aS)P (6P/6T)V = (aS/aV)T (aV/ar)P = —(aS/ap)T (6G/6P)T = V (ac/at)P = -s [6(AG/T) / amp = -AH/T2 [6(AG/T) /a(1/T)]P = AH Show your work. No credit without it. ‘, l (l2pts.) From the data on the top of this page, calculate the AVH0 and AVSi‘of vaporization of water at 298K. AH: .- Apia) — [$002) : --2:H,X —(-283‘,r) . ,— - we [<5 ’ , ' “DC” ,— if: : — H8 5/:4 2 (12 pts.) The molar heat capacity of Lead is given by: Cp(T) = 22.13 + 0.01672T. What is the AH and AS for 1 mole of lead that is heated from 300 to 400 K? « ‘ — I a AH :§Cp(1/ : 5231‘s how-2.101! r 243 30:" .‘f 7 Y : 22330): rfl0lbti’26ll @: Zing r : 9,3 km} : BBQ,“ 'r,olb'%2§{9_?) “'l gb’t’l [J 3 (l6pts). One mole of an ideal gas (CV = 30 J/mK) is expanded and heated from an initial state ofP1 = 5 atm.. T1 = 300 K to a final P2=l atm and T3 = 400 K. a. Draw a reversible path on a PV diagram b. Calculate AU. AH, and AS for the process. two [50: CVCXT; 30(_wo)-'5.okj 301: M : CPIBT=°>X7>|NW ; 38g V‘J r ' Nib ~ A : Cpl/AL r Cw‘ JAR 10-01) A Wet r +816 mam/n ’ : (Ex/5L“k 391;, t- C? (ya = v-LHZIX r $1.9? ; 1&4 . 32 _ a i go ASL 2 RD,“ Eta-27: f‘ CV MAA. 2&0 .fi ‘ rm} duo/wk“ M = ‘51“ t“ " 1M0 r/k ” C, V‘s R W? 4 (lZpts). Starting from dU = TdS — PdV, derive the corresponding expression for dG. H: U 511+de new we” > ., T513 {Ea-ifl M” #0“ F A H 2 TA 3 *rVUl AC1 : Va ? «s alt/j :%T qu’z- Va: ‘T‘ 325: T;ZOCC , CC ‘5”: pp ‘ I \~’ 341 \\ _ a 7 _ \\ ’ Tito“ Bl . \fi CL 5— Véfume 20 30 Rm 1 l \lz/uw. Fm/VJ 3 ugly Wm sad/Wt Ag 3+ VUKM+ bg‘ (C)rr€k/\t—( C1 : H ~Ts K : "Sail t ~‘30i T x b U) 5 (12pts.) Calculate the final temperature when 2 moles of H200) at 290 K (Cp=75 J/mK) are poured into 3 moles of H200) at 350 K. What is the entropy change of the hot and cold water. (33M - ca oh) : mtfigXfifi) (3 573 ~77 2—. - €80 : (03113)" 6,}. 2 H930 7:321; (4 ‘ 32¢ _ l5? «(QMBS‘I M ' (7 SB ZLIO§g26 m ASww‘o (MWWM 7737) 1/, t “t (.9? 7W4 6 (l2pts.) What is the AG when you compress one mole ofNO gas from 1 atm to 10 atm.? ll— ; '24 8' ClG : t i2: 9*} , l7 :@ LIQ- 7 (12pts.) Given that: 2N0; -> N204 ArG°300K = -4 k] Calculate ArGO, at 350 K given that AfH°(NOz) = 33kl/mol and AfHO(N204) = 9 kJ/rnol. >6 l [\H-TQS ‘ “2‘00 ASSw/N M61 A My”: All ' 33> AS " 33b 8 (12pts.) At what pressures would the Van der Waals gas boil at 120 OC? Draw the Maxwell construction to support your case. Pl) 1 Calm/K Pressure (atm) I have neither given nor received aid on this exam Please sign ...
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ea_10616 - Exam II — March. 3, 2003 Chem 181 Prof. T....

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