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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 LAt/mK = 8.314 J/mK P = RT/(Vb)  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 how2.101! 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 1001)
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ASL 2 RD,“ Eta27: 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” >
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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)"
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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*}
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:@ 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 [\HTQS ‘ “2‘00
ASSw/N M61 A
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" 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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This note was uploaded on 09/19/2008 for the course CHEM 181 taught by Professor Baer during the Spring '08 term at UCSD.
 Spring '08
 BAER

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