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image004 - tifill The desired reaction is obtained adding...

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Unformatted text preview: tifill The desired reaction is obtained adding reaction I to IE- times reaetion 2, 3 times reaction 3, and 2 times the reverse of reaetion 4: s sits} + s HCIIIaq} —+ 2 mouse} + 3 H.113) as" = -ltl49 tn fi{HCl{g} —-——s HCl[aq}] GMH" = 44.3 id} 3£Hz{g'_l + CHE] —r 2 Hlegi] 31M!“ .—. -I 35 kll 21mm, {sq} —r stems): ZiaH" = +323 kl] 2 Allis) + 3 C12{g}——I ‘2 MCI.1 {s} drH°=-l{it19k.l+t5(-?4.B kJJ-tlt—lfifi kl) + 2{+323 ItJ)=-—Ititl'i'k.l 15.62 From Appendix 2A, dH°,{DJ) = +l 42.7 kl‘ enrol" Nflaigj+fl:{g}—+ N01fg}+ 03,113] M“: +2llflld Dds) ——h;-D:[g} like: HQ? M ii}; {5} '“T’ 0(3) ° = +2492 kl N093] _" “0(3) + 0(3) as!“ = +3.35 u ‘3‘ {a} W= {1-00 mixes” 1-K" «witness: min 256?: =43? k1 T43 Torr it'll .3251 b =‘ in"? ——~— 15.5L-7so _._ 0 w P” (TfiflTotT*ah11"]( LJLLIMJ a: 4.342 It! {a} The feet that: the expansion occurs adiabatieally—wlfieh means first. the systemis isolatedfrorn itssLn-roundingssothat noheatis transferred— is important Ittellausthatq=ll, andtherefore fiU=w=-fl'.342k.l. But as! will also he equal to = nCtrAT [see equation 19] because if is a state Emotion. The heat capacity of an ideal gas is 12.5 J - K" * moi" {we will assume it is constant over this temperature range}. Therefore, 41.342 .l = {Lilli mol}(12.5 J - Isl" - mol"}[dT1I.dT == —ti‘i'.4 K. The final temperature Will be WEEK — 6?.4K == 23B.fiK . ...
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