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C112H S10 T2 - HQH SIO ra nremeug‘OIng I For the chemical...

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Unformatted text preview: HQH SIO ra nremeug‘OIng I. For the chemical reaction A —> B the value of AG" - 123 kJr’mol at 250 °K,a11d AG°= + 123 kamol at 450 °K Calculate the values of__ AS”, and_____ AH" for this reaction and also the value of Keq at 5&5 temperatmes WEDGE? H CO id. aLInelude Sign, umts o = "—IZQCZD = Afi _. QSOAS Alamo—113%... 30-15.-. AS "’23000 :5 "AH + ”SDAS AH: ~Hgo-. t;- ___________._...__.. —2%ooo = ZOOAQ A9:-I130 — [61ng : aH — Qg0&;‘ - azaOQQ ' :A‘H + sec/:39 b. Include sign, units Q2‘ibOOO-L - QCILZE C- 2355: ‘ £9.30 {5a, 2: "KTlth " [26000 : *Qa.-'>’('2QO)IHK usqxzrfl : tale 2!; K:- csgu'ztaca x10 c. Keq at 250 K = ‘ 5 Hana-ca M02“, _ .23000 7— ’ ‘6K3C 2§D>Lfl K” *rzacxzbfl = ‘chgfflm lixL-‘qua—ljll L. r..-D_-.;L_;'5 1,108? @3000: “‘6. 301903an ink: -B'2LGI3'1‘1 4:4 WOW)?! x [CD—'5 @3000 = ”fiSQ-iSONnK- 14130007: 4,799.; in IQ- lmK= 43.0: 2. For the following questions circle positive, negative, or zero which ever best applies (circle one answer only) a. A certain reaction has a value of Kw = 620 at 300 K and K.,q = 0.06 at 1200 K. It's enthalpy of reaction is: AH __ 1n 1?: a r-r' ,1 .L. _i_ \ positive zero I490 / ‘— “"8”; {50° ‘” {306.23 , -'li&,'li_.‘ci 45,416 b. Acertain reactionhas avalue on= (20 at 300 K andKet1=§ZO at 1200 K It‘s enthalpy of reaction is: ' A A H / 5’ z a .2 0 W309?) positive negative ._ a - m. c. A certa in reaction has a value of Km = 620 at _3r0_0_K_and K-oq = 529 at 1200 K. It's cut-gay of reaction is: - — — — A .3\ 0-400 5‘5 : ~13 5(399Kb-49c’1 positiv negative zero A e -— (T j d. A perfect crystalline diamond is heated to 1000 K. It's absolute en%py is: ’1‘ ’ , ,\ , ® negative zero LES . e. A perfect crystalline diamond is cooled to BE. It's absolute entropy is: positive negative @ 3. The equilibrium constant for 2 NO <=> N202 is found to be 0.03 at 300 K and to be 0.92 at 250 K. Use these datato calculate AH" for this reaction. CD R: .03 300K»- 3.h1cludesign,units. Q K; “0.5L 2 ‘50 15., .Cil AH _l__ _ ._‘_. 3 In ( 70—; : 5? 2209 2:0 mamlsts -—' A +1 (- o. OOOEIOQD) AH: -Ha.crca€ ‘I/mai hf”).- E I ~ ‘) .03. 9.3 €50 57:0 I) j . "f" q | \x 3" +435} = AH / 9/“. " Q‘bA-HJS’vrAHC ) 4. The reaction H2 -—> 2H is found to have AH" = 436 kJ/mol and AS°E 95 J/mol K.On distant star it is found that Keq = 10,000 for this reaction. Calculate thejemperatme of the star. H 15H 4&9 : —F~TJ%F- Habooo - 515T :*Cb.’-3(T)(q.mogq) ‘43me "3‘37 1 ” 7‘9'qq‘59’1 4. Incl. sigryunits. 43V000: [€2.66‘LH7T T: 7.314016%).19 K {923qu Liaxoooo — 0.9: .— flaggwx Ulraios’q) “— *1lcv,‘-4WS"EDT M 30000 '_ ‘Q-S'tgttl”! T T '- Qgt—IQQ‘ "7.5, L" 5. For the reaction Cl;(g) + 02 (g) —) 2 C10 (g) the value of 13G°= - 19,200 J/mole. At T= 298 OK. It is found that when 1302 — 0.4 atm and £13= 2atm the value ofAG at 298 = - 12, 000 J/mol. Calculate the flue of Q and also pC____-l__O0 under these conditions (showworkforcredit). A61: 2136‘ fKTInQ #51000: “151,200 + 6,3(2‘39) an 5- ‘ = . f ”1250 “iv-FIEHI nCa (Y); [email protected]:a.3—Hc infil= 'quOq—l l‘E-BWQV: = 62: learn, ' (”0(1) x1: 1.400151%: 9019:6"2'2‘WW “"2 000 ; 'ICT,2oc: +9.30.qu inQ Elm: 2q73'q JT‘IQ X: \.’2iil'~4 Ma: 9.01 X1 -_l magic a--.la.gn (4)69) * “ 6 A certain metal has-rdensity—of—SAé—g‘mol, an entropy of melting of 12 Jlmol K, an 514 enthalpy of melting of 22,500 Jimol ,aspecificJaeat-capacitwm—Tlé-Hg-e Calculate the egui libn'um melting pgint of the metal AH. ‘T I w- ‘M' '1 T 2 2,, e 0 0 {Q- T: 02:16 r— 3. Give clear definitions or examples of the following: a. Trouton‘s rule «r‘ or liquid, AC3 ‘3", E56 j/malL. b. Second law of Thermodynamics. r" 01M! spontaneous reaction, The meal mTrDF‘I -e \JhIVe/I'93 mcrques. - c. Third law of thermodynamics (1. Which of the following is the correct unit for measuring pressure ? (circle one answer only) NM3 NM2 N-Ml N—M" N-M1 N-M‘" L 161 3. Silicon and carbon are in the same vertical row and both C02 and $02 are stable compounds. Why are the properties of these two compounds so different. Explain breifly and sketh the two different types of bonding structure they may have. re eo__di¥Qre/h+ L=<E~tr$IlJ§J£B C09]; ox gas and 3:0“ I: Bonus Question: (this is worth only 3 points and it is bonus credit. Do not work on it until you have finished and checked your work on the rest of the exam). The following is from Wikipedia regarding "Maxwell's Demon" written by the great Scottish physicist I ames Clerk Maxwell: ".. if we conceive of a being whose faculties are so sharpened that he can fijllow every molecule in its course, such a being. whose attributes are as essentially finite as our own, would be able to do what is impossible to us. For we have seen that molecules in a vessel fill of air at tanfirrn temperature are moving with velocities by no means uniform, though the mean velocity of any great number of them, arbitrarily selected, is almost exactly uniform. Now let its siqipose that such a vessel is divided into two portions, A and B, by a division in which there is a small hole, and that a being, who can see the individual molecules, opens and closes this hole, so as to allow only the swifier molecules to pass from A to B, and only the slower molecules to pass fiom B to A. He will thus, without expenditure of work, raise the temperature of B and lower that of A, in contradiction to the second law ofthermoofimamics.... " To a certain extent such a demon exist in human cells in the sodium/potassium pump which generates a greater concentration of potassium ions inside the cells and a greater concentration of sodium ions outside the cells- Does the sodium/potassium pump qualify as a Maxwell's demon and thus turn the second "law" of thermodynamics into the second "suggestion" of thermodynamics. Bonus Question Answer—Circle one answer and give an explanation: does not vilolate 2nd law ' fixplanation: .Hqg. WM? acts as HA2. person potting Hag mower/ties PM!“ A "’3 of“ 5 "A’A" - Tine potassium thS ...
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