f Name:/,fwn/ue

Student lM'o3 n:
//?

w

COURSE DATE VENUE DURATION
1. 2. 3. 4. 5.

: CBB1023/CC81023 PHYSICAL CHEM|STRY (Friday) : 15 July2011 : TestRoomBlockN : 20:00 22:00hrs (120minutes)

TNSTRUCT|QNS ALL TESTEES TO write NAME,lD & SIGNATURE top of EVERY pageof the Testsheets. on ThisTestSheets contains FIVE(5) aUESTIONS withtotalof max.20 markseach. Answerin inkALL questions the provided on spaces.Eachsub-question countto max of 4 markseach. Answer all quantitative questions to mustbe NUMERICAL VALUESnotonlyequation. Forthe purpose thistest,convert results S.l. UNITS of all to ONLY.

A/ofe; (6) Thereare S_lX PAGESin thisTestSheets including coverpase this SELECTED CONSTANTS, CONVERSION FACTORS MATHEMATICAL & RELATIONSHIPS
Constants A:0.509 e : 1. 60 2 1 7 6 1 0 - 1e x C eo: 8.85419 10-12 C2m-l x J-r er= 78.54(water) Ne:6.02214x 1023 mol-r tr - 3.141592 R: 8 . 3 1 4 4 7 l K-m ol -r r Data A,(C) = 12.01 A,(H): 1.0079 A,(O): 16.00 A.(N): 14.01 A,(Na):22.99 cp,,'[co26)]: +37.11 K-l J mol-' cp,,'[Flzo(t)]: +75.291 K-t J mol'' +46.4J K-r mol'r cp,n'[Na*(aq)]--84 Cp,"[CHTCOO-(aq)]: J K-r mol-' : cp,,'[NaHCos(s)] +53.00 K-r J mol-' : A1H'[COz(S)]-393.51 mol-r kJ : -285.83 mol-r A1I{'[H2O(/)] kJ AfI'[Na*(aq)]: -240.12 mol-' kJ A1H'[CH3C (aq)]: + I 50.6kJ OO' mol-' : ArH'[NaHCOr(s)] -23L00kJ mol'' pm r(K *): 1 51 r(C l -): 1 81 pm Conversion I a tm= 1 01325 Pa I b a r: 1 05 Pa lTl,cp,,', /trrH** lorU^: pMp/p(fl * //P(a)l I = %Eizibi log yn: -lz*z-lA1/' lP: vrlp lp: Mlp/p nolo: nBlB Pr: P/Pg

/,rf (r) : /,rf Qt) +

= +.273.15 T(K) TcC)
Equations at: PelP.q* Cp- Cy: nR Co,^-Cv,.: R

pV: nRT' p:p*s'x plV: lnr RT l8 : l,If/T

/rrrS*' - /prIf /Ty, /rCp,r' /""p9 : /uorl{/76= 85 J KI mol-' ,ro"1on1rtvCp,rf : 3, 5, 6 Cr,^: e%R,e T,: T/Tc l dp/dT : /uooH/(I6I u"pl0 lU: nCrlT 4r: -pdV V : Vtnt -t Vffin : -Jz,2 Ns/8rcoriJ - I /t,J Vr'- fuI/P / robG" e2 [t l,€:/,ff-TlS V*: V/n lH: nColT Vr: V/Vg : proauarEv/ff lrlf * = -plV w - -nRT ln Q/V) ,"o"son1rEvly'{
: produc*ElCo,r' -

/rH^: /rU^ + lvrRT

y : /""u({/R (1/T- 1/T*)

Universiti Teknologi PETRONAS

Name:
1"

Student lD:

Signed

gas Carbondioxide, (perfect) is compressed 400Kintoa 2.5-Ltank suchthatthe finalpressure COz, at reaches bar. 70 a. lhe of Calculate molarvolume QOzat 70 bar and400K. -tOOc\ -t T= 460K | = 3

vt'l V=2.,1L = Z.f,xlD'

i =1oW'-7*wc?a

'ry|*& tlvd{|= 4s crr] = 2.f ru'e/g ,-'^3 .26=!.?Fxtn *tl =o.1,?$-L "ilt1 V^=V/n
b. (in Predict pressure kPa)if thetankis cooled (25oC). the backto roomtempqrature

h = fVlRT = 5'26wa6l

_ h, n RT

r-T

WlvreT= z40,Ir
2--Sx,D r

Vo

= t-)4nI3ta{}Iutl,r

= =-kPas 52tC?3
2.trL

?

Ydb k

ff initially wasat 1 atm,calculate workdoneby the compressor pumpoperating 400K. COz the at

?' = ir^e ?^rV't r'o u'-',r? TJ ;=- n{r,!,,^V -T4ogo1 $ = -74oUo d.

g2r Pa.eVi J01 ?t = l,>trvr=

= vtpr= o.lT26e+

r
1

7o

21.tvt-

,tt T --zrx.= zQB k ) of, bt. gff -T+-( 4rpK toris lr wrt - Cr,^= I R Cy,^=R+ = -/e+ ?R-=ZK cv,u Q,*-Ir,^=? AH=nCp,uzsr=5,26x4n"t0t-8r= 1tgr7l] ?- lt:€ tJ _e. lf the criticalpropefties COzare72.85atm and 304.2K, of calculate required the operating temperature final and pressure compress realgas,methane to (CHn) the samecompression a properties CHt are to factor. Critical of 45.6atmand190.6K.

"rcffito fromroomtemperature the operating to temperature.

cafcufate heat the required an from

pressure initially up*" n", at constant heat atmosptieric

= 72.8t>lw', 13&tf26' 2f ?a t Y.,o,r=

i,

kq.z( -;Av=T/T" = t'7l7cl ror=

?, Pft. o 74&9 ?r = Pft.= k?o.t = n [,ro= Yryr*. = o-118YTc.*rq13 ur41.z3( ?^ ot

T"t1 :-tr lo = 3nq r lqo(k = Al.,.vtq

= 4{al.l -<
-:-

29.€2

k

Name:
2.

Student lD:

Signed

Sofidcrystalof nitrcgen, Nz(s), showsa transition fromcubicto hexagonalcrystal struclure 35.61K, at thenit subsequently meltsandboilsat 63.14Kand77.32K respec{ively. a. graphol absolute Sketchan approximate standatd molarentrcpyvs.temperature to roomtemperature. up Label the phasenameof eachassociated temperature ranges.

t Ard t?;f'"c) crs
TCK)-

vU/rm-vf6^)l A+,sil^-f ^tEu^=
=+@"*L-r
c. ff the densityof Nz(| is 0.808g

1? A*rH4Dw9{rB:,=+2LB J Y^', *, Ptfl=Iozr^ ,V#_, o,?s^'2\,w4,' 2E;;'fr',,r*/c-t= tc6 Mur-= h&l=xE+ vh ft I" ozllz)ly,oz( - t/qST) = +228 - Gonro'Xo. 11 predic{ spontaneffy the meltingprocess it is basedon lp values, the of if

J K' mol-',calculate heatrequired the forthe crystal transition happen 50 bar in a constant to at volume vessel.

' t 'l-'l-./ :6f 67.11 1ff the densityof the cubicandhexagonal phases 0.987 cm-"and 1.026g cmo respectively lo"S,f 6.' phases 0.987g cm-'and1.026 cm{ respectively lo,S,f is 6.43 are are and and

d.

=?40 rrqja\ 6vo,,t*' b(\&, 'n ?4 + c,rfr':st?':t,r,ry;,:'7' -\-/ o61
l.,lz(t) "-

'X];':'FW - "m-', ?a' il"r(: .f xrDs:l'*tnr=f t't'or = = oL A k6l 2rr))M^ ?/f*,c = 0- ozB n1E,h'/1026+2:1? J wil1 s) = laf?/fu"e)= o.oz00z,1rr"s/308* 3.1?) vv^Q-1 A l-L(Na(t))= q dawve 6 rc Slurfrreitf ,,rrtJL+r*; '>>< lAa(V(ktn ffitA L;p,,^),k* tzt salrgro$ tb rb?(t. Vtbws &f byr+!,,2 /G* zlrow) /' tAi, pressure Calcufate vapou!'Xffil:;f the of at 70K.

"^'""'"ryPf

VY*F€-1;):"%en-h.^=/o6?, l"tl- ?z-r irl^ = lot P^" ?fr= lbzq/ Ca|culateboitingpaintofNz(/)at0.35atm,aSsUmetnatNz(g)isperfect.a(='{

4=)-*ru^.1

Ayv=v^=T=dW=6g1srntfi-,
= 143il.7874k1= o.t72st\k'l

^dg+i = K H tqL 1'r€ aru,.ri[;!,5'=?1 K #=1/o fl:77,€3l.frn-t fr-

A?^ 6f+z.z

t Tubi*t'.'J==U!4mff

Name:
3.

lD: Student

foniccrystalline pofassrum solid chloride, KCI(s), dissolved pqrewaterat 1 bar,2SoC,forming molal is in 0.05 concentration solution. of a. Basedon Bom'sequation calculate totalGtbbs's lhe eneryyforboth ions. solvation

;;,6(F)::t;i")'"i-/ai/,";,16:i/s,l-;:"@^{1
. ;-@nM| <=--

/^M(u:)= ---:r

-/>-urdck*)+h&r€(q.) '( 4 arotvA .+"lrt- -rb I o''v = - k ? t oC?? ) t'wnl-"|
b.

yourresult part (a)to yieldthe Gibbs's information thefollowing in Bom-Haber in Using cycle(inkJ mol-'), correct energychange the dissolution process, of /*nfflKCl(sll

ru

K'(g)+elglrCl(g)

122 K(g)+ i

*0[4)-e Yrft)*Q7A) 1r*q A,r,,{i' y,* Krql ffL^( rav"1y\ ,14"n"^ + 4d,,,q,t,t ! ru*6,!;';) s ^{M) +tLQ) =17? +t?2+1/8-9.11 ^l +M +gg =-tlIlon7? ),"o,8,1
:=:-

l,nd'**o't qlt, = (n* (yaw

= -lt(.t

kJ t/y\&-l

pressure the solution g5 kPa,calculate activity watermolecule the solution. lf al 76, watervapour of is the of in

W=@r
d.
r^a\ -r^-^ O n@[)= o,Vr v'^"e

a o'13K
1:=:

Lti.o 0"0f w4a'L=0.0f uv,4kc-Utw)n - = o.lzf w,tep-Q/zsnTffz} U U .

lf at 0.05molalthepaftialmolar volume KCIis 36.5cm3mol-1 thatof wateris 18.0777 mol-r, of and cmu calculate the fofalvolume 0.05molalsolution of g) containing kg (2500 of water. 2.5

;Y,X;:r;;;1,i ()trl=t?8'*6*^'( '*V+t,rr*?o t t7|' *^l8ro???N+ _?e3o!! \i = zfl?,lf cvv13
e. | -Calcufate meanionicactivity the coefficient the electrolyte the O.OS ot in inotatsolution.

J = LCoot+ 6.or)= O.oJ-

f*= rM -lz_"2__lAI/,
A^

= -l t rl f or-o7"16
=-oll78

0+=LO-c''tt?oW 4

Name:
4.

lD: Student

Signed

The reaction the kitchen of common chemicals, breadsodaand vinegariswrittenas:

+coz(g) +Hzo(/) a ca,cu,ate,r","JT;:;ff:::T:l' :"'ooNa(aq) tI'A)

:c + # ) uf, ;,r(^" :- ;;rfl;*:;;21);\ri[i?ua ortr co +Dlrt " - i+ u(^ =

"rH# -ZBf tl{D.6 -L4h,tL-713,E1

: -=r".irg'i wiri)

d ;;,c

87+ L3l- \rc.{

@o

= - 6SB kJ*41 4( =
b. volumeclosedvessel. th-q by if Calculate heatliberated the reaction it is carriedout in a constant

Ortl# =)r U tzloRf = A,ffi= 4, H,{-z;l^ fl W
^-9u6yU =*l ' U
^.V ^^A-,, 8 arfir= ^( BIlLo- 1, E3t11J"2e I

= '67013?'T J w*a'

#f,,* =lr'ffiffi ,ffi,'w:'W:llftr

r\^1e;'

c.

lf 1 kg of the breadsodahasbeenconsumed, the by air. calculate workexperienced the surrounding

y^lcos= vnr{n %ot Lt.q lVA = tqDT + Y) fry.wro, 7 lt'?m4 -?oV' ^^t AV=\/-- nW? ;. p; fi =-nKT- =*L?.LHt.n) =-n4,45 k3

84 MrCtJatt?t\= .06?-1 4"' fi

d

":X:Pff ':g'W'i*i:i" #'e-' Zl ffi il" -a zr& =a(H{-TA,ffirrl( vrdP-; 9p wol|dfil"rLa,v;\\surt$t t^d^-vrh iI=+4l )4Y

rn( *

k

'zq| K, I byr )1+ yn^,.acg ir fe verri (4a/a7uL;biu,ta

Cafcufate heafof reaction it is carried inside icebathof OoC if out temperature. the an

^r(, * =c{:eiltatil* cf^cwo*) nCf"al,) rcfil,o - (,W^rro,;
2-1t = -81iil1 + i?.ll+?sl -r? 481- o
\ d -,-,U ( (bt irrt ^ r+4 { :fiitr*?! f P,})flf tv69'In"'tr =+tof.3 ?k-{ vwoL,*l aT=L??-U|=-25

-q"tcurr$-) <u#h-l

5

=-@'

Name:
5. Letthe phase diagram shown as below.
Liquid

Student lD:

Signed

9"t

F o

g o ,o

E Solid

)5 c 6e

Solid

P=2

Composition

a.

fu, iiryo;tt^ ; ;t, ;l,n^;?t fti llt ' te aLLiXvw
C1^owI;;I-'Vw^r1e-'.

is r,1c ?il%iTijil*#ffiTffi.!',' foiryC iwtu thlil.6y tt"' t ^r4 e nid'4-

lt Ais gallium(Ga)and B is arsenic(As),both are semiconducfors, the chemical your write formulaof C. Explain

. ?"At

c.

lf the solidC is heated higher-and-higher up in temperature, phase(s) develop what will eventually, at what and composition.

+LWof@uri(q{Yn ,/ d.

J

Lf a*: Lsoba PlAory Trt{ -. (wrecv'vL ye "kL;*,

just Takeas a starta temperature composition below at thetip of lhe dotted and aa, vertical (saynamely line a5). lf the mixture thenheated explain phases is up, the development alongthe,3tages indicated a5,.a4, €2,afld81. by ?3,

z?,wIY A+os why-Mru,yi*)
1 L*o.'. Ln*^ WvxL< t cov1.T6 Fttu"t TYt Ata,, 1 L"lM (/1etL letrlrcs*{ }
+ &l-az !^we zve 2- Yltv>*zr lc.Cv\/tt^A A.-.--^ rn 9 fb& Ifu-

e, !*:t,,L,jyIT*ryoett-t'ovt uB' '/ ?ua
?we

B

(

C,y.,orf+1tu1, D{d. ,+itl

4 *rflK^

7UW

tufotffi*t)

Usethe LeverRule estimate proportion theamount phases to the of of developed ag. Usethe mm-scale your in of p.lastic to quantiff tie-line ruler the segment lengths.Assume thecomposition in mole{raction. that is

^' 'pW ='fu = 0,78 .,'p,^,rc-Ory* 1'swlv'^ {tWEND OF TEST SHEETS 5

?wvoC v Lr1u,,A ' IPl/Y^\ I