Question

CHeMical Reactions Due Hwa5 For The Reaction at 298 K 2 No 0y The valus ot 4H nd 4S are -5803 KJ aud -6.6 3/K respeetivdy. what i Valve ot AG 298 k the Tenpersture, at what Assuming that AH nd AS de aot depend tenperature is 4Go? T, AG negetive above an below this terqersture As o is cooled at 1 atn it freezes at 54.5 K to forn Solid I At a lower tenperture, Solid I reat ramges to Solid L which has a dif ferent crystal structure. Tharmal measurements Show That AH f he r- ase trunsitis -7431 3mol and As for the same trans.tion is -17.0 3/k Mol. A+ hat tenperature Sulvde I are Consider th reacthon 250, 4 2So 2) + Carried out at 2s"c and 1 atn Caleulete AH, As nd AG usn the fellowing Det s(3/kmol Substance So, 297 248 So, -316 2S7 D Ser Hnt:as Enp SASreatats

Answer 1

9uou de actfon: 2N02 C4) N204) AK -58.03 xIO JT 58 03KT AS wie kna dhat AG tandad Change bbs feee is giueu by Ag A TAs whese A Standasd Change i enalpy AsSlandasd change h enbopy 28K Cgiven TE temperatuse

alues in en a), Siubstitu tnga we haue -rges 3 A° 16. 6J -5803 x10 JT 5403.2J 5400 J = 5.40 KJ when AnoO A-TAS Thatis, A TAS gubsti ting dhe qiveu valu th eq-) we haue Tx (-66 -58-03XId J Te -58.03xIo -76.6k gb29b8E 329 K Snce at 298k which& belas 329, a hegathve, A hegatve belas 329K

743 1Jmof A R giveu -17.0 far e phase tansi ton AG 0 we knas dat at equbrium Thug, A AK-TAS =0 AR-TAS 0 An TAS 743-1m T A AS -1 43-7117647K 43.7K Seacifon Fa due 2 0 ) t) 2503G) -21Kmof 396 kfmaf Siven An Cso AKifS03 AnEnp Apaduct)En anf(eactant) whese np Storchiomeiric Coefcuet oduct Staichfo meirc Cee ffiuint eactanty Standasd Chamge c famattan peoducts we knos duat: endialpy A CPrut

An CReactont) 8tandasd chameg entalpy et fermattan Reactanty we haue Substrtatng e valuag eqn 4) O AKoxn 1x Ak Co) -C2x 39 6 kJ 2x -247 k 1 x o kJmof 792 KJ594 KJ|mof mot 198 KT 3. -148xlo mof 248 kmof giuen CS02) 259 Jk-tf 205 Jk.Mof know dhat we En SGeactants) -2) ASnnp (Pwduct)

wta Cpeduct) tamdadentpa of paductr steundad entopy eact) eactants we have ubstrta fing ke vatuas eane) 2x (s0,6)) Co2) [2xs03 ( + 1 x s - [2x 25 J Kmaf 2x 248 J f k.ma 1 x 205 J Kmo -(0 14 J Kmad 496 J t 205 J kmaf 514 J K'mot -187 J kmop Diuen Tempena tise, T- 25 C- (a5 ta13 5 K 298. 15K TASn 6 we knau fhat Auxn A Substrtatng va luas eqn -18xJ mof we hawe 298-15Kx-187J mot Aun X

55754.O5 I mof -198/000 - 142/245 15 J mol -142 245 5 KT mof 142 K미 maf