1B-Quiz-6-key

1B-Quiz-6-key - Name Ki LT Quiz 6 - Spontaneous Change 1}...

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Unformatted text preview: Name Ki LT Quiz 6 - Spontaneous Change 1} For a reaction to be spontaneous only at higher temperatures, AH“ must be P09 !T l UE while 135° must be East-mg . 2) AgN03(aq) and NaBr(aq) are combined to yield an AgBr precipitate at 25°C. The Ksp of AgBr is 5.0 x 10—13. a) What is the standard free energy change for this reaction? A; 4 B! —-> A} Eek"; Mr": —12T auK => 663’: -—(e.3m§,%-,;)(213 E31“ (Lemon) o 4 K: __.L— -__- 1.0 x‘bll = "—7.0 "ll-E :7 "70' £1 KSF Mal b) What is the free energy change if all solutions are initially present at 0.25 M? l AG: QG°+TZT1MQ + _ 5G=(q,oxlo”‘l + arms-1%:- 2431:: [M I EAQJEBJ "‘3 ( “(X 3 (o,zs\(s.zs) Q: ‘l __ 56-: "6.3)00 L .:> _ég K3 M l '——‘_" up I 3) Using the following information for the vaporization of methanol: AH°f (kL’mol) Scl UlmoLK) CH30H(1) —238.7 126.8 CH3OH(g) —200.7 239.8 a) Does methanol obey Trouton's rule (: 5 llmoI-K)? c o “I AS": 5 c9, — S (13*— ll3.0 m DUES MOT OBEH' Wrom’s RULE" b) What is the normal boiling point of methanol? AG°:0 0 ’ T A0 = mar/39° ~—> 1—: AH : “58.0%: f 'l 550 0.113103% It? oi— ==> a *3 Ft" Ida-(MEL " WLK on “.2an "m Mot-K. BP. m°=o I , a a T: 3‘59 K or. 63°C All“; Mgwbufm a __ KT AH m- 33,o_._ Y "m 4) Using the following information: Ail-1° = 126 kJIrnol 2 l _" C + 3 4 350 = “mail-K a) Is this reaction spontaneous at standard state and 25°C? 9 AG” = AH WAS ° Stove AH° ls Poswe zt As" IS MEGA?! we, 9*” '5 “Wars b) At what temperature (it any) is this reaction nonspontaneous in either the forward direction or the reverse? NON ‘ EMT. NONE. No UficLuE 0F 1‘ and MAKE AG}: 0 c) What is KP for this reaction at 377°C? onfime‘ = —- RT tut K J, [AH9_T&691 (F26 ooo — (6 ‘SOK‘l(-7‘l.‘i;:‘%) K: a "RI- 2". & _(.8'3H5 50 K.) ~32.5 _ 5' K -= a 2- ‘1 K to I 5) Using the following reaction and experimental data, determine the value of AH“. cog) + 2 H2(g) 4' CH30H(g) L ; 205x104 298K H k, ,Ti 91.4 350K __ <‘“--—_.__ K1] It 1- K1 _!5H° 1 t ' ° BAA-fig _____, fiflmmfil \ -4u 1 1 K T -____—::- : I—fl -' ‘ F3- 2. Ti z_o'5xlo ‘ > Sims-3.. 350K lfiSK “1.x. ...
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This note was uploaded on 02/12/2012 for the course CHEM 1 taught by Professor Deceutt during the Spring '11 term at Santa Monica.

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1B-Quiz-6-key - Name Ki LT Quiz 6 - Spontaneous Change 1}...

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