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Name: October 26th, 2005

EGEE 301 - Thermodynamics and Flid !echanics

Final E"am on Thermodynamics

115 mintes

#$ %&0'( )ircle the choice that *i+es the best anser to the estions

1. A common battery is

(i) an adiabatic system(ii) a closed system

(iii) an open system

2. Density of a substance is(i) an extensive property

(ii) an intensive property(iii) a molar property

3. The molar entropy

(i) an extensive property(ii) an intensive property

(iii) a molar property

4. Volume is

(i) an extensive property(ii) an intensive property(iii) a molar property

5. Which temperature in Celsius and ahrenheit is the same

(i) -30 degrees

(ii) -40 degrees

(iii) -50 degrees

!. "f #olume is fi$ed% based on the ideal &as la'

(i) P1/P2= 1/2

(ii) P1!P2= 1!2(iii) P1/P2= 2/1

(. )ne mol of an ideal &as at temperature of *+C and pressure of 1 bar occupies

(i) 22"# 103cm3

(ii) 24"# 103cm3

(iii) 2$"3 103cm3

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,. "f pressure is -ero% the compressibility factor /0 should be

(i) 0(ii) 1

(iii) 10

. "f the reduced temperature and #olume are 1% the reduced pressure of the #an der

Waals &as is

(i) 0(ii) 1

(iii) 2

1*. The molar heat capacity is

(i) an extensive property

(ii) an intensive property

(iii) none o% t&e above

11. The internal ener&y is

(i) a %'nction o% state(ii) a %'nction o% process


12. The standard pressure for presentin& thermodynamic properties is

(i) 0"1 Pa

(ii) 1 atm

(iii) 10 psi

13. Wor is

(i) a %'nction o% state(ii) a %'nction o% process


14. A small #ariation of the enthalpy% d% is

(i) a per%ect di%%erential

(ii) an imper%ect di%%erential

(iii) bot& o% t&e above

15. A small #ariation of heat% d% is

(i) a per%ect di%%erential(ii) an imper%ect di%%erential


1!. The 'or done on a system by en#ironment is

(i) positive

(ii) negative

(iii) eit&er positive or negative

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1(. The heat released by a system to uni#erse is

(i) positive(ii) negative


1,. CVis

(i) larger t&an p

(ii) smaller t&an p(iii) e*'al to p

1. Cp of an ideal monatomic &as is

(i) (5/2)+(ii) (3/2)+

(iii) (#/2)+

2*. "n an isochoric process heat euals(i) ent&alpy

(ii) entropy(iii) internal energy

21. A chemical reaction% 'hich has a positi#e 6r$n% is called

(i) exot&ermic(ii) endot&ermic


22. The enthalpy of formation of 2&0 is

(i) , 0

(ii) 0(iii) = 0

23. "f Cp is constant then 7T87To

(i) = p ln(/o)

(ii) = p ( . o)

(iii) = p (/o)

24. or a re#ersible heat en&ine

(i) 11= 22

(ii) 1/1= 2/ 2(iii) 1/ 1= 2/ 2

25. The efficiency of an ideal heat en&ine is defined as

(i) =1-2/1

(ii) =1-2/1


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2!. d9T is

(i) a per%ect di%%erential

(ii) an imper%ect di%%erential(iii) bot& o% t&e above

2(. de7 can be(i) ,0

(ii) 0


2,. di7 can be

(i) 0

(ii) 0(iii) bot& o% t&e above

2. "f the absolute temperature approaches -ero% then

(i) 0(ii) 0

(iii) 0

3*. The combined 1stand 2nd:a's of thermodynamics for re#ersible and closed

systems 'ithout chemical reactions0 can be e$pressed as

(i) d = d6 7 d(ii) d = - Pd8 7 d

(iii) d = d 7 Pd8

31. "t is possible to determine the absolute #alue of

(i) ent&alpy

(ii) entropy(iii) none o% t&e above

32. The heat capacity of a substance can be

(i) , 0

(ii) 0

(iii) = 0

33. "f entropy of a system is decreasin&% the order in the system

(i) is increasing

(ii) is decreasing(iii) is not c&anging

34. At euilibrium% the entropy production achie#es

(i) minim'm

(ii) 9ero


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35. or the same substance

(i) (solid) (gas)

(ii) (solid) , (gas)(iii) (solid) : (gas)

3!. The enthalpy of e#aporation should be(i) , 0

(ii) 0

(iii) 0

3(. "f the number of microstates W0 is 1**% the molar entropy is

(i) ;"314 < mol-1-1

(ii) 1>"15 < mol-1-1(iii) 3;"2> < mol-1-1

3,. The chemical potential is

(i) an extensive property(ii) an intensive property


3. Affinity is

(i) a %'nction o% state

(ii) a %'nction o% process(iii) none o% t&e above

4*. "f affinity is ne&ati#e% the reaction can proceed

(i) to t&e rig&t

(ii) to t&e le%t


41. Diffusion of molecules is due to

(i) a concentration gradient(ii) a c&emical potential gradient

(iii) a gravitation gradient

42. The internal ener&y is a thermodynamic potential if

(i) ? 8 = constant

(ii) ? 8 = constant

(iii) ? P = constant

43. "f temperature and #olume are constant% the thermodynamic potential is

(i) @elm&olt9%ree energy(ii) entropy

(iii) ibbs %ree energy

44. The chemical potential of the i8th component is

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(i) (AB/ACi)?8

(ii) (A/ACi)?p


45. The chemical potential of a pure substance is

(i) t&e molar ibbs %ree energy(ii) t&e molar ent&alpy

(iii) t&e molar entropy

4!. The chemical reaction affinity is

(i) (A/AD)?8

(ii) (A@/A D)?p


4(. The partial molar entropy is

(i) (A/ACE)?8

(ii) (A/ACE)?P(iii) (A/ACE)?

4,. The partial molar enthalpy can be

(i) ,0

(ii) 0


4. "f pressure is close to -ero% the fu&acity approaches

(i) 0(ii) 1

(iii) t&e press're

5*. "f temperature approaches *% the isochoric heat capacity of a pure solid approaches

(i) 0

(ii) + (iii) 3+

51. "f temperature is uite hi&h% the isochoric heat capacity of a pure solid approaches

(i) 0(ii) +

(iii) 3+

52. or a #an der Waals &as% C+and C+%ideal are

(i) e*'al

(ii) not e*'al(iii) slig&tly di%%erent

53. "ce and 'ater are in euilibrium if

(i) @(ice) = @(Fater)

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(ii) (ice) = (Fater)

(iii) G(ice) = G(Fater)

54. At room temperature and atmospheric pressure% the stable phase of 2) is

(i) @2H(g)

(ii) @2H(l)(iii) @2H(s)

55. At atmospheric pressure and temperature of 3* o% the stable phase of 2) is

(i) @2H(g)

(ii) @2H(l)

(iii) @2H(s)

5!. At temperature of 125oC% the saturated pressure of 'ater is about

(i) 0"5 bar

(ii) 1"0 bar

(iii) 1"5 bar

5(. At temperatures and pressures abo#e the critical point

(i) gas p&ase can not be li*'e%ied

(ii) gas p&ase can be li*'e%ied

(iii) gas p&ase can be slig&tly li*'e%ied

5,. )n a saturated #apor cur#e% d;9dT could be ne&ati#e if

(i) I@vapori9 , 0 and I8vapori9 , 0

(ii) I@vapori9 , 0 and I8vapori9 0(iii) I@vapori9 0 and I8vapori9 , 0

5. "f pressure is *., bar% 'ater 'ill boil at temperature

(i) , 100 o

(ii) 100 o

(iii) : 100o

!*. The de&ree of freedom in the triple point of 'ater is

(i) 0

(ii) 1(iii) 2

!1. The de&ree of freedom in the critical point of 'ater is

(i) 0

(ii) 1

(iii) 2

!2. An a-eotropic solution

(i) can be separated to tFo components 'sing distillation

(ii) can not be separated to tFo components 'sing distillation

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(iii) can be partially separated to tFo components 'sing distillation

!3. "n the composition trian&le center% the molar fractions of all three components are

(i) e*'al

(ii) di%%erent

(iii) 9ero

!4. "n i&ure (.1* if 7: < *.5 :; the system has

(i) more vapor t&an li*'id(ii) more li*'id t&an vapor

(iii) abo't t&e same amo'nt o% vapor and li*'id

!5. "n a first8order phase transition% #olumes of both phases are

(i) e*'al

(ii) not e*'al

(iii) sero

!!. "n a first8order phase transition the molar =ibbs ener&ies of both phases are

(i) e*'al(ii) not e*'al

(iii) 9ero

!(. The acti#ity coefficient can be

(i) positive

(ii) negative


!,. >ased on the enry?s la'% if the partial pressure of C)2in air is increasin& its

concentration in a lae 'ater is

(i) increasing

(ii) decreasing

(iii) not c&anging

!. >ased on the @aoults la'% the partial pressure of 'ater abo#e an aueous solution

is

(ii) larger t&an t&e partial press're above p're Fater(ii) smaller t&an t&e partial press're above p're Fater

(iii) abo't t&e same

(*. The enthalpy of formation of Ba0 is

(i) , 0

(ii) = 0(iii) 0

(1. The ionic stren&th of 1 mol &81Cu7)4a0 solutions is

(i) 1mol Eg-1

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(ii) 2 mol Eg-1

(iii) 4 mol Eg-1

(2. "f the solubility product% spis 1*81*% the salt solubility

(i) 10-3mol Eg-1

(ii) 10-5

mol Eg-1

(iii) 10-10mol Eg-1

(3. "n a dilute electrolyte solutions if the electrolyte concentration is decreasin& the

acti#ity coefficient is

(i) increasing

(ii) decreasing

(iii) in not c&anging

(4. The chemical reaction #elocity is

(i) + %/+r

(ii) + r- +%(iii) +%- +r

(5. The rate constant% i% depends on

(i) temperat're

(ii) concentration

(iii) bot& temperat're and concentration

(!. The rate constant of an elementary reaction is of the 1storder can be obtained

plottin&

(i) JKL vs" time

(ii) ln JKL vs" time

(iii) 1/JKL vs" time

((. The rate constant of an elementary reaction is of the 2ndorder can be obtained

plottin&

(i) JKL vs" time

(ii) ln JKL vs" time

(iii) 1/JKL vs" time

(,. The euilibrium constant depends on

(i) temperat're

(ii) concentration

(iii) temperat're and concentration

(. "f the =ibbs free ener&y of a reaction is ne&ati#e% the euilibrium constant is

(i) , 1

(ii) = 1

(iv) 1

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##$ %10'( )alclate the Gibbs .ree ener*y %/Gor"n(, enthaly /or"n, and entroy

/or"nchan*es, as ell as the eilibrim constant %( at 25o) and 1 bar .or the

methane combstion reaction, )4%*( 2 O2%*( )O2%*( 22O%l($

Iorxn= 2 Io

%J@2H? lL 7 Io

%JH2? gL - Io%J@4? gL . 2 I

o%JH2? gL = - ;1;"3 E< mol

-1

I@orxn= 2 I@o

%J@2H? lL 7 I@o

%JH2? gL - I@o%J@4? gL . 2 I@

o%JH2? gL = - ;>0"4 E< mol

-1

Iorxn= (I@o

rxn - Io

rxn)/ = 241"; < mol-1-1

= exp (-Iorxn/(+)) = 1"3>

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Download - 2005 Final Exam EME 301

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