Practice Exam 3 Addendum Work-out

Practice Exam 3 Addendum Work-out - Practice Exam 3...

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Unformatted text preview: Practice Exam 3 Addendum, Chapter 1’7 Questions A (CHAP 17} One mole of an ideal gas at 300 K expands from 2.0 L to 9.0 L against a constant external pressore of 1.8 atm. The work done by this expansion is (in L'atm): 9.0 on 1. 0 2.-1 0.0821 3001 -~ 3.-300 4.5 1.8 (4.41.8 9.0~ ( )( )( )n[2.0] ( X )( ) KW )( 3 . :f . - .r J‘ . x 2.0) 5. {0.0821)(300) 5' r" tiff 25;: #2571 t G a) B (CRAP 17) Which of the foliowing reactions has the largest positive entropy change? 1. Page) + C12(g) -> Page) ’41 2Nag) + 02%) —+ 2N20(g) {3;} fl} 2N02(s) W» Note) t 026%) 4. C02(g) —> 02(g) + C(s) /“ .i f ‘ '. . W m I w- we r a i iii“ 5.}bCXg)—9 H200) f9) QVii {g t} W - tangy-wt was! gig-y C (CHAP 17) "A spontaneous change is always accompanied by an increase in entropy." The entropy change referred to in this statement is: 1- Assystein (iigfisuniversc 3- ASreversible 4- ASsurroundings 5- none Ufa-less 'D (CHAP 17) The best measure of the spontaneity of a process is: i. the change in the number of moles of gaseous species. 2. the change in internal energy ofthe process. {Shire change in free energy of the process. e’tfeww'ww“ 4. the change in enthalpy of the process. 5. the change in entropy of the process. 1. (CHAP 17) Given AG? “—“ 671.1 kJ/mol for $03 and AG? 5 600.3 kJ/moi for 802, what is AG“ for the foliowing reaction? 3302(3) “5‘ 02(g) we 2503(g). «:{j a Frazier-.53} r f (gig Veterinary I x W ~ giafo I), / “9:7” 1 we? ~:: £2?st jg“ W ngW “god/M”? f gigs-I)?” /W{(f{‘ M was w g; t t t a J "r 2. (CHAP 17) For the reaction, PCI.5(g) zi PCl3(g) + C12(g), [Ellie = +925 kl and «$80 = +182 J/K at 2980K. Assuming fill" and @S‘) do not change with temperature, (a) calculate {EEG} at 550°K, (b) is the reaction spontaneous or not? explain your choice. " (A : Wm. GE a? fi€“t fflfifitflwgeeflrtmafi%§ g; $22.. --»~ melt 2:; l; fill? it c 6" a; t»?- 3. (CHAP 17) The equilibrium constant for the reaction PC15(g) @ PC13(g) + C12(g) is KP m 2.2 x r 10"7 at 25°C. Calculate filG" for this reaction. a 5° m m a ,1 F m M ‘ "u (m , » if: X w L ( gwi? ‘5‘ ’ tél’; “ti/ft )( «Z r W" l laéktlev“regreoefilzl(tttfijfttfiti) aéfi$KtE7“ ...
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This note was uploaded on 06/02/2011 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.

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Practice Exam 3 Addendum Work-out - Practice Exam 3...

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