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**Unformatted text preview: **la. fix-Tl f-"ibi inÂ»: I'- m CHEM 304 â€” Midterm 1 (11/2/07)
FALL 2007 Circulation of this coarse material without written consent from Dr. Shantanu
Sharma is expressly prohibited and will be regarded as academic dishonesty. F Question Number lPoints I
1 l /20 /10 I70 I /30
l |â€”]U1AM,N H
O Useful reminders: R:8.314imol" 1C1 11:9.870x10'l Latm
= 0.08206 L atm mot1 K" = 10- L bar PVâ€™ =constant, wherey : Cp/(â€˜v
: 5/3 (monatomic gas molecules)
: 7/5 (linear gas molecules)
= 8/6 (nonlinear gas molecules) P = â€”i] I van der Waals state equation Vâ€”b V2 f)! llâ€˜l' I) The fact that dH is; an exact differential implies: which one ofthe following (20
points): H: Ul i'iw'
{,th AJUUâ€™ 3Hâ€ 4â€ VA? AHâ€œâ€” CTbbT T rthâ€™ 1* ink?
51â€œ: (75143 â€œxi-MO) r + V'Af AH: mart/Ar: â€˜. HQ?)
i, swim Mâ€™
(+3 3} 34' S 2) The Joule-Thomson coefï¬cient depends on temperature and pressure, but assuming an
a\ erage constant value orâ€˜0.15 K bar'1 for N2(g), estimate the drOp in temperature if N2(g)
undergoes a drop in pressure of 200 bar. Must un- be constant in this case" (10 points). â€™fP:JT
xiAjTLJ) (3').â€ ll
â€˜1l/yk' 19â€œ I JUL'I. C I HÂ» â€˜\h i "â€˜ . I ( .e. ï¬‚l
SSMMâ€˜IMKB ï¬lm 5â€œ L J J â€˜ I 'i r '3 iv} Ã©ï¬rxnkwnl / 1A,ro Must dub E6 Cemic , J Miâ€œ â€˜1â€˜} [iii (â€˜3â€™ #237 A?
I)? ,_ 2: n1 1 git-ow
it Egg/(3t. i 2 3) lâ€™or each of the following statements, identify which state functi0n(s) is (are) being
described If any ofyour responses involve entropy. make it clear whether you mean SW.
SHUT) Sunw a) It enables one to ï¬nd the rates ofchange of enthalpy with respect to temperature at
constant pressure. b) it enables one to ï¬nd the rates of change of internal energy with respect to temperature
at constant volume. d) It is maximized when a system reaches equilibrium. e) [t is minimized when a closed S) stem capable ofonly P-Vwork and held atrconstant temperature and pressurefeaches equilibrium. f) It is minimized when a closed system capable of only Pâ€”Vwork and held at constant
temperature and volume reaches equilibrium. "gï¬‚he function(s) in the following set of functions that is (are) not extensive: CV, Cp, U,
17", Pls, c', 4, V. â€˜i, - .Â» . ... t. _
Hi7 {settiLï¬' â€˜ 1 \â€œ".T"-:'|:""'- â€˜i g . 5 . I, t, , ;_ _â€˜ g .t:
V .. .. A 4) Consider the isothermal expansion of 5.25 mole; of an ideal gas at 450 K from an
initial pressure of 15.0 bar to a ï¬nal pressure of 3.50 bar. For 10 points each: a) Describe the process that will result in the Greatest amount of work being done by the system with P > 350 bar and calculate w. â€˜â€” Yr: viz-vs.th enema! _ c; 7Wpr aÂ» LAC Â» QANâ€™: "jÂ£f Amt :: e an: 9% L W/r;)
: , M7 13â€œ _ #rï¬‚ï¬/lal
W/Fl_ -\ : â€œ rill/7 ï¬e : crsygcmk) [tin qurg tutor) is [j 1\r P ' ,
J; rammm ? 12le F___r,/ b) Describe the process that will result in the Wang done by the
system B, > 3.50 bar and calculate w. .rh'ruarâ€˜ _ {Emma Cohiâ€™rwlâ€™ Palâ€”W4â€? ZAYDQU 1C-oâ€˜stv Gâ€˜ï¬‚ohliw c) What is the least amount of work done without restrictions on the external pressure? rm = o .3 Laeâ€˜ï¬aï¬‚vrizg #l 1 EL : 19le : want ~ :Q;Â§.ocï¬‚>t(â€™~) â€˜A 1 (Cl-LCÂ». 5) Consider the melting of 325.0 g ofwater at 0.00 3C and 1.00 atm. The densities of
liquid water and ice may be taken to be 1.000 g cm" and 0.917000g cm'q, respectively. The molar enthalpv offusion of ice is 6.02 kJa_r__n_l_l_. Atomic weights are: H, 1.008 g mol' ;0, 15999 g mol' . Note that all quantities refer to changes that occur in or on the
53 stem. With this information, solve parts aâ€”g (10 points each). yrâ€”j) W'Jk H'LL,
/
a) Determine q for this constant pressure process (Hint: ï¬nd the moles of water ï¬rst): 6/ :_ :tOElJe ,â€” Ggsog/ï¬ie) a x < 193â€˜ at? g to- b) Calculate AH for this proeess and describe it as exothermic or endothermic: :2 Ehcl9lLï¬‚â€™1hâ€™lL â€˜---â€”â€”'â€”-â€”...\_ (1) Calculate the change in volume, AV, and the vxork done, w: Du: vtâ€” V'. views-.0 â€œVlgcllrl> ï¬‚ â€œï¬‚ .- 3 ï¬‚
('7, '8â€˜ "â€˜l 3, a $9 mil a?) :el\ â€œ2.7M m m â€™ .0l/ gm
1 c} 3([0 M L
l W ' E mun it? -:. AL,
._i_w5__rm_ _f___*_#________f
N _ flig- Dâ€
Z 2 ( 1k ) d) Calculate AU: c) Calculate AS and comment on [he spomaneiLy ofthe process: AK: 3ch F wine Me? U } 36571:? 3/1,;
.Fâ€” â€” / Fâ€”â€”._,_T__ï¬â€”â€˜â€”
l 973; 1?]: Ag???) ) 5o 'TR'Z Wch a; @drvi/igpï¬xÃ©v mmm 0 Calculate AA: 1N7: AHâ€™ TAS 3 AHâ€œ? : Sï¬ [Sâ€˜wendhaï¬r 4w 0 ...

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- Fall '07
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- Physical chemistry, pH